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.

CVSS Vector

References

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