---
cve: "CVE-2026-75757"
severity: "HIGH"
cvss: 8.3
epss: "22.1%"
vendor: "ash-project"
kev: false
exploited: false
published: "2026-08-31 03:16:42"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T15:33:57+02:00"
---

# CVE-2026-75757

> 8.3 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 91da87c1c23cd6199ba1b0a1c8849a4c605130cc (Commit)
- e93a3408a85035e1f90275d02bc2470c96095e56 (Commit)

## Referenzen

- <https://github.com/ash-project/ash_admin/security/advisories/GHSA-3259-55fp-w94j>
- <https://cna.erlef.org/cves/CVE-2026-75757.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-75757>
- <https://github.com/ash-project/ash_admin/commit/e93a3408a85035e1f90275d02bc2470c96095e56>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-75757) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_