🛡️ CVE-2026-63771 on Ubuntu — adminer

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-63771 as tracked by Ubuntu, for the package adminer. No fixed version has been recorded for this distribution yet.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. Rated impact: confidentiality high, integrity low, availability none.

Weakness class

UBUNTU-CVE-2026-63771 is classified as CWE-113: HTTP Response Splitting. Unescaped input reaches an HTTP header, letting an attacker inject line breaks and forge additional headers or responses.

Affected software

UBUNTU-CVE-2026-63771 is recorded against 1 package.

adminer

Timeline and source

Published on 20 July 2026 and last revised on 29 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
github.com (Report)
github.com (Report)

Details

Severity Unknown

CVSS Score N/A

CVSS Vector 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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-07-20

Updated 2026-08-20

Modified 2026-07-29

Fix URL N/A

Affected Packages

Software	From version	Fixed in
adminer	—	—

References

REPORT https://ubuntu.com/security/CVE-2026-63771

REPORT https://www.cve.org/CVERecord?id=CVE-2026-63771

REPORT https://github.com/vrana/adminer/issues/1298

REPORT https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h

🔗 NVD 🔗 Mitre

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