CVE-2026-75757 (GCVE-0-2026-75757)
Vulnerability from cvelistv5
Published
2026-08-31 02:20
Modified
2026-08-31 14:50
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-565 - Reliance on Cookies without Validation and Integrity Checking
Summary
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.
AshAdmin'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.
This issue affects ash_admin: from 0.9.1 before 1.3.1.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ash-project | ash_admin |
Version: 0.9.1 ≤ cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:* |
|||||||
|
|||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-75757",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-31T14:50:38.307857Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-31T14:50:59.043Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/ash-project/ash_admin/security/advisories/GHSA-3259-55fp-w94j"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"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": "\u003cp\u003eReliance on Cookies without Validation and Integrity Checking vulnerability in ash-project ash_admin lets an attacker who controls a sibling subdomain rebind an admin\u0027s session to a different actor, tenant, or authorization mode.\u003c/p\u003e\n\u003cp\u003eAshAdmin\u0027s client JavaScript read its state cookies (\u003ccode\u003etenant\u003c/code\u003e, \u003ccode\u003eactor_resource\u003c/code\u003e, \u003ccode\u003eactor_primary_key\u003c/code\u003e, \u003ccode\u003eactor_action\u003c/code\u003e, \u003ccode\u003eactor_domain\u003c/code\u003e, \u003ccode\u003eactor_authorizing\u003c/code\u003e, \u003ccode\u003eactor_paused\u003c/code\u003e) by matching the cookie name with an unanchored regular expression (\u003ccode\u003enew RegExp(name + \"=([^;]+)\")\u003c/code\u003e) against the whole \u003ccode\u003edocument.cookie\u003c/code\u003e. 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 \u003ccode\u003exactor_authorizing\u003c/code\u003e) with \u003ccode\u003eDomain=.example.com\u003c/code\u003e that flows unvalidated into the admin\u0027s LiveSocket connect params. The fix matches cookie names by exact equality.\u003c/p\u003e\n\u003cp\u003eThis issue affects ash_admin: from 0.9.1 before 1.3.1.\u003c/p\u003e"
},
{
"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\u0027s session to a different actor, tenant, or authorization mode.\n\nAshAdmin\u0027s 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\u0027s 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\u0027s session to a different actor, tenant, or authorization mode.\n\nAshAdmin\u0027s 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\u0027s 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": "2026-08-31T14:50:59.043Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-75757\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-31T14:50:38.307857Z\"}}}], \"references\": [{\"url\": \"https://github.com/ash-project/ash_admin/security/advisories/GHSA-3259-55fp-w94j\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-31T14:50:54.736Z\"}}], \"cna\": {\"title\": \"AshAdmin cookie reader matches names by substring, enabling actor/session shadowing from a sibling subdomain\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"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\"}], \"impacts\": [{\"capecId\": \"CAPEC-31\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 8.3, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"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\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"LOW\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/ash-project/ash_admin\", \"vendor\": \"ash-project\", \"product\": \"ash_admin\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.9.1\", \"lessThan\": \"1.3.1\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/ash_admin\", \"packageName\": \"ash_admin\", \"programFiles\": [\"assets/js/app.js\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/ash-project/ash_admin\", \"vendor\": \"ash-project\", \"product\": \"ash_admin\", \"versions\": [{\"status\": \"affected\", \"version\": \"77a43cc4fa04cb59c38fc434568a35a38ecb995a\", \"lessThan\": \"e93a3408a85035e1f90275d02bc2470c96095e56\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/ash-project/ash_admin\", \"packageName\": \"ash-project/ash_admin\", \"programFiles\": [\"assets/js/app.js\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://github.com/ash-project/ash_admin/security/advisories/GHSA-3259-55fp-w94j\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-75757.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-75757\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/ash-project/ash_admin/commit/e93a3408a85035e1f90275d02bc2470c96095e56\", \"tags\": [\"patch\"]}], \"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\u0027s session to a different actor, tenant, or authorization mode.\\n\\nAshAdmin\u0027s 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\u0027s 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\": \"\u003cp\u003eReliance on Cookies without Validation and Integrity Checking vulnerability in ash-project ash_admin lets an attacker who controls a sibling subdomain rebind an admin\u0027s session to a different actor, tenant, or authorization mode.\u003c/p\u003e\\n\u003cp\u003eAshAdmin\u0027s client JavaScript read its state cookies (\u003ccode\u003etenant\u003c/code\u003e, \u003ccode\u003eactor_resource\u003c/code\u003e, \u003ccode\u003eactor_primary_key\u003c/code\u003e, \u003ccode\u003eactor_action\u003c/code\u003e, \u003ccode\u003eactor_domain\u003c/code\u003e, \u003ccode\u003eactor_authorizing\u003c/code\u003e, \u003ccode\u003eactor_paused\u003c/code\u003e) by matching the cookie name with an unanchored regular expression (\u003ccode\u003enew RegExp(name + \\\"=([^;]+)\\\")\u003c/code\u003e) against the whole \u003ccode\u003edocument.cookie\u003c/code\u003e. 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 \u003ccode\u003exactor_authorizing\u003c/code\u003e) with \u003ccode\u003eDomain=.example.com\u003c/code\u003e that flows unvalidated into the admin\u0027s LiveSocket connect params. The fix matches cookie names by exact equality.\u003c/p\u003e\\n\u003cp\u003eThis issue affects ash_admin: from 0.9.1 before 1.3.1.\u003c/p\u003e\", \"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\u0027s session to a different actor, tenant, or authorization mode.\\n\\nAshAdmin\u0027s 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\u0027s 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\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…