CVE-2026-75757

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Any cookie whose name merely ends with the requested name therefore matches, and whichever is serialized first wins. Because cookies are shared across a registrable domain, a compromised sibling subdomain can set a shadowing cookie (for example <code>xactor_authorizing</code>) with <code>Domain=.example.com</code> that flows unvalidated into the admin's LiveSocket connect params. The fix matches cookie names by exact equality.</p>\n<p>This issue affects ash_admin: from 0.9.1 before 1.3.1.</p>"}, {"base64": false, "type": "text/markdown", "value": "Reliance on Cookies without Validation and Integrity Checking vulnerability in ash-project ash_admin lets an attacker who controls a sibling subdomain rebind an admin's session to a different actor, tenant, or authorization mode.\n\nAshAdmin's client JavaScript read its state cookies (`tenant`, `actor_resource`, `actor_primary_key`, `actor_action`, `actor_domain`, `actor_authorizing`, `actor_paused`) by matching the cookie name with an unanchored regular expression (`new RegExp(name + \"=([^;]+)\")`) against the whole `document.cookie`. Any cookie whose name merely ends with the requested name therefore matches, and whichever is serialized first wins. Because cookies are shared across a registrable domain, a compromised sibling subdomain can set a shadowing cookie (for example `xactor_authorizing`) with `Domain=.example.com` that flows unvalidated into the admin's LiveSocket connect params. The fix matches cookie names by exact equality.\n\nThis issue affects ash_admin: from 0.9.1 before 1.3.1."}], "value": "Reliance on Cookies without Validation and Integrity Checking vulnerability in ash-project ash_admin lets an attacker who controls a sibling subdomain rebind an admin's session to a different actor, tenant, or authorization mode.\n\nAshAdmin's client JavaScript read its state cookies (tenant, actor_resource, actor_primary_key, actor_action, actor_domain, actor_authorizing, actor_paused) by matching the cookie name with an unanchored regular expression (new RegExp(name + \"=([^;]+)\")) against the whole document.cookie. Any cookie whose name merely ends with the requested name therefore matches, and whichever is serialized first wins. Because cookies are shared across a registrable domain, a compromised sibling subdomain can set a shadowing cookie (for example xactor_authorizing) with Domain=.example.com that flows unvalidated into the admin's LiveSocket connect params. The fix matches cookie names by exact equality.\n\nThis issue affects ash_admin: from 0.9.1 before 1.3.1."}], "impacts": [{"capecId": "CAPEC-31", "descriptions": [{"lang": "en", "value": "CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 8.3, "baseSeverity": "HIGH", "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:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-565", "description": "CWE-565 Reliance on Cookies without Validation and Integrity Checking", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-08-31T02:20:17.985Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/ash-project/ash_admin/security/advisories/GHSA-3259-55fp-w94j"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-75757.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-75757"}, {"tags": ["patch"], "url": "https://github.com/ash-project/ash_admin/commit/e93a3408a85035e1f90275d02bc2470c96095e56"}], "source": {"discovery": "EXTERNAL"}, "title": "AshAdmin cookie reader matches names by substring, enabling actor/session shadowing from a sibling subdomain"}, "adp": [{"references": [{"url": "https://github.com/ash-project/ash_admin/security/advisories/GHSA-3259-55fp-w94j", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-31T14:50:38.307857Z", "id": "CVE-2026-75757", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-31T14:50:59.043Z"}}]}}

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Any cookie whose name merely ends with the requested name therefore matches, and whichever is serialized first wins. Because cookies are shared across a registrable domain, a compromised sibling subdomain can set a shadowing cookie (for example xactor_authorizing) with Domain=.example.com that flows unvalidated into the admin's LiveSocket connect params. The fix matches cookie names by exact equality.\n\nThis issue affects ash_admin: from 0.9.1 before 1.3.1.", "supportingMedia": [{"type": "text/html", "value": "<p>Reliance on Cookies without Validation and Integrity Checking vulnerability in ash-project ash_admin lets an attacker who controls a sibling subdomain rebind an admin's session to a different actor, tenant, or authorization mode.</p>\n<p>AshAdmin's client JavaScript read its state cookies (<code>tenant</code>, <code>actor_resource</code>, <code>actor_primary_key</code>, <code>actor_action</code>, <code>actor_domain</code>, <code>actor_authorizing</code>, <code>actor_paused</code>) by matching the cookie name with an unanchored regular expression (<code>new RegExp(name + \"=([^;]+)\")</code>) against the whole <code>document.cookie</code>. Any cookie whose name merely ends with the requested name therefore matches, and whichever is serialized first wins. Because cookies are shared across a registrable domain, a compromised sibling subdomain can set a shadowing cookie (for example <code>xactor_authorizing</code>) with <code>Domain=.example.com</code> that flows unvalidated into the admin's LiveSocket connect params. The fix matches cookie names by exact equality.</p>\n<p>This issue affects ash_admin: from 0.9.1 before 1.3.1.</p>", "base64": false}, {"type": "text/markdown", "value": "Reliance on Cookies without Validation and Integrity Checking vulnerability in ash-project ash_admin lets an attacker who controls a sibling subdomain rebind an admin's session to a different actor, tenant, or authorization mode.\n\nAshAdmin's client JavaScript read its state cookies (`tenant`, `actor_resource`, `actor_primary_key`, `actor_action`, `actor_domain`, `actor_authorizing`, `actor_paused`) by matching the cookie name with an unanchored regular expression (`new RegExp(name + \"=([^;]+)\")`) against the whole `document.cookie`. Any cookie whose name merely ends with the requested name therefore matches, and whichever is serialized first wins. Because cookies are shared across a registrable domain, a compromised sibling subdomain can set a shadowing cookie (for example `xactor_authorizing`) with `Domain=.example.com` that flows unvalidated into the admin's LiveSocket connect params. The fix matches cookie names by exact equality.\n\nThis issue affects ash_admin: from 0.9.1 before 1.3.1.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-565", "description": "CWE-565 Reliance on Cookies without Validation and Integrity Checking"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "1.3.1", "versionStartIncluding": "0.9.1"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-08-31T02:20:17.985Z"}}}, "cveMetadata": {"cveId": "CVE-2026-75757", "state": "PUBLISHED", "dateUpdated": "2026-08-31T14:50:59.043Z", "dateReserved": "2026-08-30T23:30:01.239Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-08-31T02:20:17.985Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

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