CVE-2026-63771 – Adminer < 5.4.3 Cookie Injection via X-Forwarded-Prefix Header

CVE ID :CVE-2026-63771

Published : July 20, 2026, 7:17 p.m. | 27 minutes ago

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.

Severity: 7.1 | HIGH

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