CVE-2026-103655

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-103655", "assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "state": "PUBLISHED", "assignerShortName": "CIRCL", "dateReserved": "2026-10-01T08:08:52.909Z", "datePublished": "2026-10-01T08:08:55.013Z", "dateUpdated": "2026-10-01T15:25:55.269Z"}, "containers": {"cna": {"affected": [{"cpes": ["cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*"], "modules": ["app/Controller/UsersController.php (otp method)"], "product": "MISP", "programFiles": ["app/Controller/UsersController.php"], "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": "Tanguy Snoeck of NCIA"}, {"lang": "en", "type": "remediation developer", "value": "iglocska"}, {"lang": "en", "type": "remediation developer", "value": "Claude Opus 5.5 (1M context)"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>MISP contains a vulnerability in its two-factor authentication (TOTP) verification process that permits a valid one-time code to be accepted more than once within its time-based validity window.</p><p>The issue exists in the user login flow where a TOTP code is verified as a second authentication factor. Because the system did not record whether a given TOTP period had already been consumed, the same code remained valid for its entire time window (typically 30 seconds). An attacker who captures a legitimate code during a user's login could replay it to authenticate a second session as that user.</p><p>Preconditions:</p><p>- The target user has TOTP-based two-factor authentication enabled.</p><p>- The attacker is in a position to observe or intercept the TOTP code during a legitimate login (e.g., network-level interception, shoulder surfing, or a compromised client).</p><p>- The replay must occur within the TOTP validity period.</p><p>Security impact:</p><p>- Unauthorized account access by replaying a captured one-time code.</p><p>- Potential compromise of threat-intelligence data and administrative functions accessible to the targeted user.</p><p>Affected versions: &lt;v2.5.48.</p>"}], "value": "MISP contains a vulnerability in its two-factor authentication (TOTP) verification process that permits a valid one-time code to be accepted more than once within its time-based validity window.\n\nThe issue exists in the user login flow where a TOTP code is verified as a second authentication factor. Because the system did not record whether a given TOTP period had already been consumed, the same code remained valid for its entire time window (typically 30 seconds). An attacker who captures a legitimate code during a user's login could replay it to authenticate a second session as that user.\n\nPreconditions:\n\n- The target user has TOTP-based two-factor authentication enabled.\n\n- The attacker is in a position to observe or intercept the TOTP code during a legitimate login (e.g., network-level interception, shoulder surfing, or a compromised client).\n\n- The replay must occur within the TOTP validity period.\n\nSecurity impact:\n\n- Unauthorized account access by replaying a captured one-time code.\n\n- Potential compromise of threat-intelligence data and administrative functions accessible to the targeted user.\n\nAffected versions: <v2.5.48."}], "impacts": [{"capecId": "CAPEC-122", "descriptions": [{"lang": "en", "value": "CAPEC-122 Session Hijacking"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 9.3, "baseSeverity": "CRITICAL", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"format": "SSVC", "other": {"content": {"options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "Supplier", "timestamp": "2026-10-01T07:52:43Z", "version": "2.0.3"}, "type": "SSVC"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-294", "description": "CWE-294 Authentication Bypass via Logical Flaw", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "shortName": "CIRCL", "dateUpdated": "2026-10-01T08:08:55.013Z"}, "references": [{"name": "Security patch", "tags": ["patch"], "url": "https://github.com/MISP/MISP/commit/a020fa47b"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>The fix introduces a single-use enforcement mechanism for TOTP codes. Upon successful verification, the system records the TOTP period step in a Redis key scoped to the user and step number, using a SET-NX (set-if-not-exists) operation with a TTL of three times the TOTP period. Any subsequent attempt to authenticate with a code from the same period will fail the SET-NX check and be rejected, effectively making each TOTP code single-use within its validity window.</p>"}], "value": "The fix introduces a single-use enforcement mechanism for TOTP codes. Upon successful verification, the system records the TOTP period step in a Redis key scoped to the user and step number, using a SET-NX (set-if-not-exists) operation with a TTL of three times the TOTP period. Any subsequent attempt to authenticate with a code from the same period will fail the SET-NX check and be rejected, effectively making each TOTP code single-use within its validity window."}], "title": "MISP TOTP Code Replay Allows Duplicate Authentication Within Validity Period", "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. 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UI:N: no user interaction beyond the victim's normal login is required. VC:H / VI:H: successful exploitation grants full access to the targeted user's account, including threat-intelligence data and administrative capabilities. VA:L: the attacker could disrupt services by modifying or deleting data. SC/SI/SA:N: no impact on secondary systems is evidenced.", "fixSummary": "The fix introduces a single-use enforcement mechanism for TOTP codes. Upon successful verification, the system records the TOTP period step in a Redis key scoped to the user and step number, using a SET-NX (set-if-not-exists) operation with a TTL of three times the TOTP period. 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A new private method __claimTotpStep() was added, which computes the TOTP step (intdiv of elapsed time over period), constructs a Redis key of the form misp:otp:totp_used:{userId}:{step}, and attempts a SET with NX and EX (3x period) flags via RedisTool. The login proceeds only if both the TOTP verification and the claim succeed. 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Upon successful verification, the system records the TOTP period step in a Redis key scoped to the user and step number, using a SET-NX (set-if-not-exists) operation with a TTL of three times the TOTP period. Any subsequent attempt to authenticate with a code from the same period will fail the SET-NX check and be rejected, effectively making each TOTP code single-use within its validity window.", "supportingMedia": [{"type": "text/html", "value": "<p>The fix introduces a single-use enforcement mechanism for TOTP codes. Upon successful verification, the system records the TOTP period step in a Redis key scoped to the user and step number, using a SET-NX (set-if-not-exists) operation with a TTL of three times the TOTP period. Any subsequent attempt to authenticate with a code from the same period will fail the SET-NX check and be rejected, effectively making each TOTP code single-use within its validity window.</p>", "base64": false}]}], "references": [{"url": "https://github.com/MISP/MISP/commit/a020fa47b", "name": "Security patch", "tags": ["patch"]}], "descriptions": [{"lang": "en", "value": "MISP contains a vulnerability in its two-factor authentication (TOTP) verification process that permits a valid one-time code to be accepted more than once within its time-based validity window.\n\nThe issue exists in the user login flow where a TOTP code is verified as a second authentication factor. Because the system did not record whether a given TOTP period had already been consumed, the same code remained valid for its entire time window (typically 30 seconds). An attacker who captures a legitimate code during a user's login could replay it to authenticate a second session as that user.\n\nPreconditions:\n\n- The target user has TOTP-based two-factor authentication enabled.\n\n- The attacker is in a position to observe or intercept the TOTP code during a legitimate login (e.g., network-level interception, shoulder surfing, or a compromised client).\n\n- The replay must occur within the TOTP validity period.\n\nSecurity impact:\n\n- Unauthorized account access by replaying a captured one-time code.\n\n- Potential compromise of threat-intelligence data and administrative functions accessible to the targeted user.\n\nAffected versions: <v2.5.48.", "supportingMedia": [{"type": "text/html", "value": "<p>MISP contains a vulnerability in its two-factor authentication (TOTP) verification process that permits a valid one-time code to be accepted more than once within its time-based validity window.</p><p>The issue exists in the user login flow where a TOTP code is verified as a second authentication factor. Because the system did not record whether a given TOTP period had already been consumed, the same code remained valid for its entire time window (typically 30 seconds). An attacker who captures a legitimate code during a user's login could replay it to authenticate a second session as that user.</p><p>Preconditions:</p><p>- The target user has TOTP-based two-factor authentication enabled.</p><p>- The attacker is in a position to observe or intercept the TOTP code during a legitimate login (e.g., network-level interception, shoulder surfing, or a compromised client).</p><p>- The replay must occur within the TOTP validity period.</p><p>Security impact:</p><p>- Unauthorized account access by replaying a captured one-time code.</p><p>- Potential compromise of threat-intelligence data and administrative functions accessible to the targeted user.</p><p>Affected versions: &lt;v2.5.48.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-294", "description": "CWE-294 Authentication Bypass via Logical Flaw"}]}], "providerMetadata": {"orgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "shortName": "CIRCL", "dateUpdated": "2026-10-01T08:08:55.013Z"}}}, "cveMetadata": {"cveId": "CVE-2026-103655", "state": "PUBLISHED", "dateUpdated": "2026-10-01T15:25:55.269Z", "dateReserved": "2026-10-01T08:08:52.909Z", "assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "datePublished": "2026-10-01T08:08:55.013Z", "assignerShortName": "CIRCL"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*"], "modules": ["app/Controller/UsersController.php (otp method)"], "product": "MISP", "programFiles": ["app/Controller/UsersController.php"], "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 a vulnerability in its two-factor authentication (TOTP) verification process that permits a valid one-time code to be accepted more than once within its time-based validity window.\n\nThe issue exists in the user login flow where a TOTP code is verified as a second authentication factor. Because the system did not record whether a given TOTP period had already been consumed, the same code remained valid for its entire time window (typically 30 seconds). An attacker who captures a legitimate code during a user's login could replay it to authenticate a second session as that user.\n\nPreconditions:\n\n- The target user has TOTP-based two-factor authentication enabled.\n\n- The attacker is in a position to observe or intercept the TOTP code during a legitimate login (e.g., network-level interception, shoulder surfing, or a compromised client).\n\n- The replay must occur within the TOTP validity period.\n\nSecurity impact:\n\n- Unauthorized account access by replaying a captured one-time code.\n\n- Potential compromise of threat-intelligence data and administrative functions accessible to the targeted user.\n\nAffected versions: <v2.5.48."}], "id": "CVE-2026-103655", "lastModified": "2026-10-01T16:17:37.487", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "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": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/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": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "type": "Secondary"}], "ssvcV203": [{"source": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "ssvcData": {"options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "Supplier", "timestamp": "2026-10-01T07:52:43Z", "version": "2.0.3"}}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-103655", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-01T15:25:45.460434Z", "version": "2.0.3"}}]}, "published": "2026-10-01T09:17:07.867", "references": [{"source": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "url": "https://github.com/MISP/MISP/commit/a020fa47b"}], "sourceIdentifier": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-294"}], "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.5.48)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "MISP", "source": "cna", "vendor": "MISP"}, "product": "misp", "vendor": "misp"}], "created": "2026-10-01T09:45:04.954626+00:00", "updated": "2026-10-01T20:30:04.552423+00:00", "vendors": ["misp", "misp$PRODUCT$misp"]}