{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-75757", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-08-30T23:30:01.239Z", "datePublished": "2026-08-31T02:20:17.985Z", "dateUpdated": "2026-08-31T02:20:17.985Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "packageName": "ash_admin", "packageURL": "pkg:hex/ash_admin", "product": "ash_admin", "programFiles": ["assets/js/app.js"], "repo": "https://github.com/ash-project/ash_admin", "vendor": "ash-project", "versions": [{"lessThan": "1.3.1", "status": "affected", "version": "0.9.1", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "packageName": "ash-project/ash_admin", "packageURL": "pkg:github/ash-project/ash_admin", "product": "ash_admin", "programFiles": ["assets/js/app.js"], "repo": "https://github.com/ash-project/ash_admin", "vendor": "ash-project", "versions": [{"lessThan": "e93a3408a85035e1f90275d02bc2470c96095e56", "status": "affected", "version": "77a43cc4fa04cb59c38fc434568a35a38ecb995a", "versionType": "git"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.3.1", "versionStartIncluding": "0.9.1", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Peter Ullrich"}, {"lang": "en", "type": "reporter", "value": "Peter Ullrich"}, {"lang": "en", "type": "remediation developer", "value": "Zach Daniel / Ash Project"}, {"lang": "en", "type": "coordinator", "value": "Jonatan M\u00e4nnchen / EEF"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "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."}], "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"}}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.hex.pm", "cpes": ["cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "packageName": "ash_admin", "packageURL": "pkg:hex/ash_admin", "product": "ash_admin", "programFiles": ["assets/js/app.js"], "repo": "https://github.com/ash-project/ash_admin", "vendor": "ash-project", "versions": [{"lessThan": "1.3.1", "status": "affected", "version": "0.9.1", "versionType": "semver"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "packageName": "ash-project/ash_admin", "packageURL": "pkg:github/ash-project/ash_admin", "product": "ash_admin", "programFiles": ["assets/js/app.js"], "repo": "https://github.com/ash-project/ash_admin", "vendor": "ash-project", "versions": [{"lessThan": "e93a3408a85035e1f90275d02bc2470c96095e56", "status": "affected", "version": "77a43cc4fa04cb59c38fc434568a35a38ecb995a", "versionType": "git"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "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."}], "id": "CVE-2026-75757", "lastModified": "2026-08-31T03:16:42.133", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "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": "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/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": "LOW", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}, "published": "2026-08-31T03:16:42.133", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-75757.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ash-project/ash_admin/commit/e93a3408a85035e1f90275d02bc2470c96095e56"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ash-project/ash_admin/security/advisories/GHSA-3259-55fp-w94j"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-75757"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-565"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"created": "2026-08-31T03:30:05.266530+00:00", "updated": "2026-08-31T03:30:05.266535+00:00", "vendors": []}