# CVE-2026-63771: adminer: Adminer before 5.4.3 contains a cookie injection vulnerability that allows attackers to manipulate cookie attributes...

CVE-2026-63771 is fixed in adminer on 1 platform by DEBIAN-CVE-2026-63771 (version 5.4.3+dfsg-1), released July 21, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-63771
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0043
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 20, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | adminer Debian 14 | 5.4.3+dfsg-1 | [DEBIAN-CVE-2026-63771](https://patchblox.com/security/data/fix/linux/debian-cve-2026-63771.md) | Jul 21, 2026 |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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