CVE-2026-63771

Name	CVE-2026-63771
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
adminer (PTS)	bullseye	4.7.9-2	vulnerable
	bookworm	4.8.1-1	vulnerable
	trixie	5.2.1+dfsg-1	vulnerable
	forky, sid	5.4.4+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
adminer	source	(unstable)	5.4.3+dfsg-1

https://github.com/vrana/adminer/issues/1298
https://github.com/vrana/adminer/security/advisories/GHSA-c533-9qwm-8w5h