---
cve: "CVE-2026-77454"
severity: "MEDIUM"
cvss: 5.9
epss: "6.5%"
vendor: "ash-project"
kev: false
exploited: false
published: "2026-08-30 12:17:17"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T21:11:51+02:00"
---

# CVE-2026-77454

> 5.9 MEDIUM · 🧪 PoC

## Beschreibung

Incorrect Authorization vulnerability in ash-project ash_sql allows a caller to bypass a scoping or authorization filter expressed as exists/2 over a relationship that declares both a limit (or from_many?) and a parent(...)-referencing filter or sort.

AshSql.Join.related_query/3 skips the caller-supplied exists predicate for such relationships and delegates it to limit_from_many/5. When the relationship's own filter or sort references parent(...), limit_from_many/5 takes a branch that drops both the limit and the predicate, emitting a bare correlated EXISTS with no predicate. The check then matches any record that has any related row. Most severely, when the expression backs a policy (for example authorize_if expr(exists(memberships, user_id == ^actor(:id)))), the actor-scoping condition disappears and the policy passes for any actor with any related row.

This issue affects ash_sql: from 0.4.1 before 0.7.1.

## CVSS-Vektor

```
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
```

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

## Patch verfügbar (OSV)

- cfe94c67484270db0f46384bd35cf1fbad8793d5 (Commit)
- 865fdd4e5e70724a23b19c048e6768c31d2209ab (Commit)

## Referenzen

- <https://github.com/ash-project/ash_sql/security/advisories/GHSA-8v9m-8pxv-738c>
- <https://cna.erlef.org/cves/CVE-2026-77454.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-77454>
- <https://github.com/ash-project/ash_sql/commit/865fdd4e5e70724a23b19c048e6768c31d2209ab>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-77454) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_