CVE-2026-34959: Vrana Adminer

Medium severity, CVSS 4.7. EPSS: 0.3% chance of exploitation in the next 30 days.

Adminer 4.6.0 before 5.5.0 prepends the client-supplied X-Forwarded-Prefix header to $_SERVER["REQUEST_URI"] with no trusted-proxy check and no validation of the prefix value. An attacker can supply an absolute URL (e.g. X-Forwarded-Prefix: https://evil.example) that flows into Location redirect headers, the Set-Cookie path attribute, and self-referential links. This enables an authenticated open redirect after state-changing POSTs, unauthenticated control of the session cookie path attribute, and poisoning of self-referential links; CR/LF cannot be injected, so header splitting/XSS is not possible.

Affected products

• Vrana Adminer: before 5.5.0 (fixed in 5.5.0)

Published 2026-08-25. Last modified 2026-09-08.