---
cve: "CVE-2026-63771"
severity: "MEDIUM"
cvss: 6.0
epss: "0.4%"
vendor: "vrana"
kev: false
exploited: false
published: "2026-07-20 19:17:29"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-02T05:00:35+02:00"
---

# CVE-2026-63771

> 6.0 MEDIUM · 🧪 PoC

## Beschreibung

Adminer before 5.4.3 contains a cookie injection vulnerability that allows attackers to manipulate cookie attributes by injecting arbitrary values through the unsanitized X-Forwarded-Prefix HTTP header used in Set-Cookie path attributes. Attackers can exploit a misconfigured reverse proxy to downgrade SameSite protection and enable cross-origin authenticated requests, bypassing cookie security controls.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 189869c4a8f0f897848cdb58493b572178084d6c (Commit)

## Referenzen

- <https://github.com/vrana/adminer/issues/1298>
- <https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h>
- <https://github.com/vrana/adminer/releases#release-v5.4.3>
- <https://www.vulncheck.com/advisories/adminer-cookie-injection-via-x-forwarded-prefix-header>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-63771) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_