CVE-2026-34959
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
- Adminer
- CVSS 4.0
- 5.3 MEDIUM
- CVSS 3.1
- 4.7 MEDIUM
- EPSS
- 0.2% (11th percentile)
- Weakness
- CWE-20
- NVD status
- Received
- Published
- 2026-08-25
No indexed exploits for CVE-2026-34959 yet
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