{"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 Männchen / 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":{"dateUpdated":"2026-08-31T02:20:17.985Z","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","shortName":"EEF"},"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"}},"cveMetadata":{"assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","assignerShortName":"EEF","cveId":"CVE-2026-75757","datePublished":"2026-08-31T02:20:17.985Z","dateReserved":"2026-08-30T23:30:01.239Z","dateUpdated":"2026-08-31T02:20:17.985Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"}