CVE-2026-75757 (GCVE-0-2026-75757)
Vulnerability from cvelistv5 – Published: 2026-08-31 02:20 – Updated: 2026-08-31 02:20
VLAI
EPSS
VEX
Title
AshAdmin cookie reader matches names by substring, enabling actor/session shadowing from a sibling subdomain
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.
Severity
CWE
- CWE-565 - Reliance on Cookies without Validation and Integrity Checking
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ash-project/ash_admin/security… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-75757.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-75757 | related |
| https://github.com/ash-project/ash_admin/commit/e… | patch |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| ash-project | ash_admin |
Affected:
0.9.1 , < 1.3.1
(semver)
cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:* |
||
| ash-project | ash_admin |
Affected:
77a43cc4fa04cb59c38fc434568a35a38ecb995a , < e93a3408a85035e1f90275d02bc2470c96095e56
(git)
cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:* |
{
"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",
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{
"lessThan": "1.3.1",
"status": "affected",
"version": "0.9.1",
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}
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{
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],
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"packageURL": "pkg:github/ash-project/ash_admin",
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"status": "affected",
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"versionType": "git"
}
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"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"
},
{
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"type": "coordinator",
"value": "Jonatan M\u00e4nnchen / EEF"
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"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"
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"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."
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"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": [
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"capecId": "CAPEC-31",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies"
}
]
}
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"Recovery": "NOT_DEFINED",
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"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 8.3,
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"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",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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"description": "CWE-565 Reliance on Cookies without Validation and Integrity Checking",
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"providerMetadata": {
"dateUpdated": "2026-08-31T02:20:17.985Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
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"references": [
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"tags": [
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"url": "https://github.com/ash-project/ash_admin/security/advisories/GHSA-3259-55fp-w94j"
},
{
"tags": [
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"url": "https://cna.erlef.org/cves/CVE-2026-75757.html"
},
{
"tags": [
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-75757"
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"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"
}
},
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"datePublished": "2026-08-31T02:20:17.985Z",
"dateReserved": "2026-08-30T23:30:01.239Z",
"dateUpdated": "2026-08-31T02:20:17.985Z",
"state": "PUBLISHED"
},
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"vulnerability-lookup:meta": {
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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