CVE-2026-63771: Vrana Adminer

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Vrana Adminer: before 5.4.3 (fixed in 5.4.3)

Published 2026-07-20. Last modified 2026-07-23.