CVE-2026-103237

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-103237", "assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "state": "PUBLISHED", "assignerShortName": "CIRCL", "dateReserved": "2026-09-30T09:56:33.891Z", "datePublished": "2026-09-30T09:56:35.584Z", "dateUpdated": "2026-09-30T17:08:51.346Z"}, "containers": {"cna": {"affected": [{"cpes": ["cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*"], "modules": ["AttributesController", "EventReportsController", "EventsController", "ObjectReferencesController", "ShadowAttributesController", "UsersController", "AppModel", "Event model", "MispAttribute model", "MispObject model", "ShadowAttribute model", "Sighting model"], "product": "MISP", "repo": "https://github.com/MISP/MISP", "vendor": "MISP", "versions": [{"lessThan": "2.5.48", "status": "affected", "version": "0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Jeroen Pinoy"}, {"lang": "en", "type": "remediation developer", "value": "iglocska"}, {"lang": "en", "type": "remediation developer", "value": "Claude Opus 5"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>MISP contains an improper input validation vulnerability in its ORM save path. When a user submits data through various endpoints (attribute add/edit, event edit, free-text import, sighting capture, shadow attribute proposal, event report creation, object reference add, user admin edit), the application sanitizes the flat record by stripping the primary key and pinning the event_id or object_id to the caller's context. However, the underlying ORM's set() method gives priority to a nested key whose name matches the model alias and discards the outer scalar fields.</p><p>An authenticated user with basic write permissions can exploit this by embedding a nested block under the model alias key inside their request. The sanitization logic (id removal, event_id pinning) is applied to the outer record, but the ORM binds to the inner record instead, which carries an attacker-chosen id and event_id. This allows the attacker to overwrite, re-parent, or soft-delete rows belonging to other organizations or events they have no read access to.</p><p>Impact:</p><p>- Cross-tenant data integrity compromise (attribute values rewritten, objects re-parented to attacker events, rows soft-deleted)</p><p>- Affects multiple entity types: Attribute, Object, EventReport, Sighting, AttributeTag, ShadowAttribute</p><p>- Requires only a low-privilege authenticated account with perm_add</p><p>Affected versions: &lt;2.5.48</p>"}], "value": "MISP contains an improper input validation vulnerability in its ORM save path. When a user submits data through various endpoints (attribute add/edit, event edit, free-text import, sighting capture, shadow attribute proposal, event report creation, object reference add, user admin edit), the application sanitizes the flat record by stripping the primary key and pinning the event_id or object_id to the caller's context. However, the underlying ORM's set() method gives priority to a nested key whose name matches the model alias and discards the outer scalar fields.\n\nAn authenticated user with basic write permissions can exploit this by embedding a nested block under the model alias key inside their request. The sanitization logic (id removal, event_id pinning) is applied to the outer record, but the ORM binds to the inner record instead, which carries an attacker-chosen id and event_id. This allows the attacker to overwrite, re-parent, or soft-delete rows belonging to other organizations or events they have no read access to.\n\nImpact:\n\n- Cross-tenant data integrity compromise (attribute values rewritten, objects re-parented to attacker events, rows soft-deleted)\n\n- Affects multiple entity types: Attribute, Object, EventReport, Sighting, AttributeTag, ShadowAttribute\n\n- Requires only a low-privilege authenticated account with perm_add\n\nAffected versions: <2.5.48"}], "impacts": [{"capecId": "CAPEC-24", "descriptions": [{"lang": "en", "value": "CAPEC-24 Parameter Tampering"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 8.3, "baseSeverity": "HIGH", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-639", "description": "CWE-639 Authorization Bypass Through User-Controlled Key", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-20", "description": "CWE-20 Improper Input Validation", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "shortName": "CIRCL", "dateUpdated": "2026-09-30T09:56:35.584Z"}, "references": [{"name": "Security patch", "tags": ["patch"], "url": "https://github.com/MISP/MISP/commit/9485ae40d"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>The fix introduces a defensive save() override in the base model class that refuses to persist any record where the data array simultaneously contains a nested key matching the model alias and other top-level scalar fields, logging a warning and returning false. Additionally, all code paths that sanitize and save records (free-text import, module result processing, object delta merge, attribute bulk edit, sighting capture, shadow attribute proposal, event report creation) now explicitly unset the nested alias key from the data array before calling save(), ensuring the ORM cannot be redirected to an attacker-chosen row. Controller-level request reshaping was also corrected to avoid creating self-referencing data structures.</p>"}], "value": "The fix introduces a defensive save() override in the base model class that refuses to persist any record where the data array simultaneously contains a nested key matching the model alias and other top-level scalar fields, logging a warning and returning false. Additionally, all code paths that sanitize and save records (free-text import, module result processing, object delta merge, attribute bulk edit, sighting capture, shadow attribute proposal, event report creation) now explicitly unset the nested alias key from the data array before calling save(), ensuring the ORM cannot be redirected to an attacker-chosen row. Controller-level request reshaping was also corrected to avoid creating self-referencing data structures."}], "title": "MISP: Nested Model Alias Key Bypasses Sanitization to Modify Cross-Tenant Rows", "x_gcve": [{"extensions": {"bcp-05-x-01": {"ai_annotations": [{"ai_level": "generated", "description": "Draft vulnerability metadata was generated from a git-format patch using an Ollama-hosted language model. Human validation is required before publication.", "gna_source": 1, "models": [{"gna_source": 1, "identifier": "qwen3.8:27b", "name": "qwen3.8:27b", "source": "ollama"}], "review_status": "full", "scope": "record", "tags": ["ai-computer-assisted:llm-generated", "ai-computer-assisted:classification"]}]}, "bcp-05-x-02": {"x_patch2vuln": {"assumptions": ["The affected version boundary is inferred from the tag_version_boundary metadata (v2.5.48); the exact last affected release and first fixed release are not explicitly stated in the patch.", "PR:L assumes the attacker needs only a basic authenticated account with perm_add; the regression tests confirm a non-admin, non-sync role suffices, but the minimum permission set is not exhaustively enumerated in the patch.", "VA:N assumes soft-delete is treated as an integrity impact (data state change) rather than an availability impact; if the organization considers soft-deleted records as unavailable, VA could be raised to L.", "CAPEC-24 (Parameter Tampering) is the closest available pattern; the specific ORM-level key-binding manipulation does not have a dedicated CAPEC entry, so the mapping is approximate.", "The Co-Authored-By line references an AI tool (Claude Opus 5); it is listed as a tool credit, not a human remediation developer, per CVE credit role semantics.", "The commit date is 2026-09-25; the vulnerability may have existed for an unknown duration prior to reporting."], "capecRationale": [{"capecId": "CAPEC-24", "rationale": "The attacker tampers with the structure of request parameters by injecting a nested key matching the model alias, causing the ORM to target a different row than the application intended. The outer parameters (sanitized id, pinned event_id) are effectively ignored in favor of the attacker-controlled inner parameters. This is a structural parameter tampering attack exploiting the ORM's data-binding semantics. The mapping is the closest available CAPEC; no more specific pattern for ORM-level key injection exists in the CAPEC catalog."}], "commit": "9485ae40d334471882e3bd246651acaa68feef34", "confidence": "high", "credits": [{"lang": "en", "type": "reporter", "value": "Jeroen Pinoy"}, {"lang": "en", "type": "remediation developer", "value": "iglocska"}, {"lang": "en", "type": "remediation developer", "value": "Claude Opus 5"}], "cvssRationale": "AV:N - MISP is a network-accessible web application. AC:L - The attack requires only crafting a request with a nested alias key; no race condition or complex state is needed. AT:N - No in-transit tampering required. PR:L - An authenticated user with basic write permission (perm_add) suffices; no admin or sync role needed. UI:N - No victim interaction required. VC:N - The attacker does not gain new read access; the impact is on data they can already partially see or infer. VI:H - The attacker can overwrite, re-parent, or soft-delete rows in the same instance, causing high integrity loss to the vulnerable component's data. VA:N - Soft-delete is a state change (integrity) rather than a service disruption. SC:N - No impact on separate components' confidentiality. SI:H - The cross-tenant nature means integrity of other organizations' data (a separate security scope) is compromised. SA:N - No security mechanism is weakened.", "fixSummary": "The fix introduces a defensive save() override in the base model class that refuses to persist any record where the data array simultaneously contains a nested key matching the model alias and other top-level scalar fields, logging a warning and returning false. 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Added a new regression test suite (tests/testregressions.py) with cross-tenant attack scenarios and wired it into the CI workflow.", "patchTruncated": false, "patches": [{"commit": "9485ae40d334471882e3bd246651acaa68feef34", "patchSha256": "03af388a5ac0d93cebef902e0050aa8496aae8d88d1496b80abc0b9a929cb39a", "source": "https://github.com/MISP/MISP/commit/9485ae40d.patch", "sourceUrl": "https://github.com/MISP/MISP/commit/9485ae40d.patch", "subject": "fix: [security] A nested model alias key no longer selects"}], "source": "https://github.com/MISP/MISP/commit/9485ae40d.patch", "subject": "fix: [security] A nested model alias key no longer selects", "tagVersionBoundary": {"commits_after_fix": 23, "repository": "https://github.com/MISP/MISP", "tag": "v2.5.48", "version": "2.5.48", "version_type": "semver"}, "weaknessRationale": [{"cweId": "CWE-639", "rationale": "The attacker controls the row identifier (id) inside the nested alias block, which the ORM uses to select the target row. 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Additionally, all code paths that sanitize and save records (free-text import, module result processing, object delta merge, attribute bulk edit, sighting capture, shadow attribute proposal, event report creation) now explicitly unset the nested alias key from the data array before calling save(), ensuring the ORM cannot be redirected to an attacker-chosen row. 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Additionally, all code paths that sanitize and save records (free-text import, module result processing, object delta merge, attribute bulk edit, sighting capture, shadow attribute proposal, event report creation) now explicitly unset the nested alias key from the data array before calling save(), ensuring the ORM cannot be redirected to an attacker-chosen row. Controller-level request reshaping was also corrected to avoid creating self-referencing data structures.", "supportingMedia": [{"type": "text/html", "value": "<p>The fix introduces a defensive save() override in the base model class that refuses to persist any record where the data array simultaneously contains a nested key matching the model alias and other top-level scalar fields, logging a warning and returning false. Additionally, all code paths that sanitize and save records (free-text import, module result processing, object delta merge, attribute bulk edit, sighting capture, shadow attribute proposal, event report creation) now explicitly unset the nested alias key from the data array before calling save(), ensuring the ORM cannot be redirected to an attacker-chosen row. Controller-level request reshaping was also corrected to avoid creating self-referencing data structures.</p>", "base64": false}]}], "references": [{"url": "https://github.com/MISP/MISP/commit/9485ae40d", "name": "Security patch", "tags": ["patch"]}], "descriptions": [{"lang": "en", "value": "MISP contains an improper input validation vulnerability in its ORM save path. When a user submits data through various endpoints (attribute add/edit, event edit, free-text import, sighting capture, shadow attribute proposal, event report creation, object reference add, user admin edit), the application sanitizes the flat record by stripping the primary key and pinning the event_id or object_id to the caller's context. However, the underlying ORM's set() method gives priority to a nested key whose name matches the model alias and discards the outer scalar fields.\n\nAn authenticated user with basic write permissions can exploit this by embedding a nested block under the model alias key inside their request. The sanitization logic (id removal, event_id pinning) is applied to the outer record, but the ORM binds to the inner record instead, which carries an attacker-chosen id and event_id. This allows the attacker to overwrite, re-parent, or soft-delete rows belonging to other organizations or events they have no read access to.\n\nImpact:\n\n- Cross-tenant data integrity compromise (attribute values rewritten, objects re-parented to attacker events, rows soft-deleted)\n\n- Affects multiple entity types: Attribute, Object, EventReport, Sighting, AttributeTag, ShadowAttribute\n\n- Requires only a low-privilege authenticated account with perm_add\n\nAffected versions: <2.5.48", "supportingMedia": [{"type": "text/html", "value": "<p>MISP contains an improper input validation vulnerability in its ORM save path. When a user submits data through various endpoints (attribute add/edit, event edit, free-text import, sighting capture, shadow attribute proposal, event report creation, object reference add, user admin edit), the application sanitizes the flat record by stripping the primary key and pinning the event_id or object_id to the caller's context. However, the underlying ORM's set() method gives priority to a nested key whose name matches the model alias and discards the outer scalar fields.</p><p>An authenticated user with basic write permissions can exploit this by embedding a nested block under the model alias key inside their request. The sanitization logic (id removal, event_id pinning) is applied to the outer record, but the ORM binds to the inner record instead, which carries an attacker-chosen id and event_id. This allows the attacker to overwrite, re-parent, or soft-delete rows belonging to other organizations or events they have no read access to.</p><p>Impact:</p><p>- Cross-tenant data integrity compromise (attribute values rewritten, objects re-parented to attacker events, rows soft-deleted)</p><p>- Affects multiple entity types: Attribute, Object, EventReport, Sighting, AttributeTag, ShadowAttribute</p><p>- Requires only a low-privilege authenticated account with perm_add</p><p>Affected versions: &lt;2.5.48</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-639", "description": "CWE-639 Authorization Bypass Through User-Controlled Key"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-20", "description": "CWE-20 Improper Input Validation"}]}], "providerMetadata": {"orgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "shortName": "CIRCL", "dateUpdated": "2026-09-30T09:56:35.584Z"}}}, "cveMetadata": {"cveId": "CVE-2026-103237", "state": "PUBLISHED", "dateUpdated": "2026-09-30T17:08:51.346Z", "dateReserved": "2026-09-30T09:56:33.891Z", "assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "datePublished": "2026-09-30T09:56:35.584Z", "assignerShortName": "CIRCL"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*"], "modules": ["AttributesController", "EventReportsController", "EventsController", "ObjectReferencesController", "ShadowAttributesController", "UsersController", "AppModel", "Event model", "MispAttribute model", "MispObject model", "ShadowAttribute model", "Sighting model"], "product": "MISP", "repo": "https://github.com/MISP/MISP", "vendor": "MISP", "versions": [{"lessThan": "2.5.48", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "MISP contains an improper input validation vulnerability in its ORM save path. When a user submits data through various endpoints (attribute add/edit, event edit, free-text import, sighting capture, shadow attribute proposal, event report creation, object reference add, user admin edit), the application sanitizes the flat record by stripping the primary key and pinning the event_id or object_id to the caller's context. However, the underlying ORM's set() method gives priority to a nested key whose name matches the model alias and discards the outer scalar fields.\n\nAn authenticated user with basic write permissions can exploit this by embedding a nested block under the model alias key inside their request. The sanitization logic (id removal, event_id pinning) is applied to the outer record, but the ORM binds to the inner record instead, which carries an attacker-chosen id and event_id. This allows the attacker to overwrite, re-parent, or soft-delete rows belonging to other organizations or events they have no read access to.\n\nImpact:\n\n- Cross-tenant data integrity compromise (attribute values rewritten, objects re-parented to attacker events, rows soft-deleted)\n\n- Affects multiple entity types: Attribute, Object, EventReport, Sighting, AttributeTag, ShadowAttribute\n\n- Requires only a low-privilege authenticated account with perm_add\n\nAffected versions: <2.5.48"}], "id": "CVE-2026-103237", "lastModified": "2026-09-30T18:18:15.917", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.3, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-103237", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-30T17:08:29.034418Z", "version": "2.0.3"}}]}, "published": "2026-09-30T10:17:16.687", "references": [{"source": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "url": "https://github.com/MISP/MISP/commit/9485ae40d"}], "sourceIdentifier": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-639"}], "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,2.5.48)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "inferred", "scores": [{"score": 100.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "MISP", "source": "cna", "vendor": "MISP"}, "product": "misp", "vendor": "misp"}], "created": "2026-09-30T11:15:15.246395+00:00", "updated": "2026-09-30T11:30:18.246168+00:00", "vendors": ["misp", "misp$PRODUCT$misp"]}