Vrana Adminer up to 5.4.x X-Forwarded-Prefix/REQUEST_URI redirect

Summaryinfo

A vulnerability marked as problematic has been reported in Vrana Adminer up to 5.4.x. The affected element is an unknown function. The manipulation of the argument X-Forwarded-Prefix/REQUEST_URI leads to redirect. This vulnerability is referenced as CVE-2026-34959. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Vrana Adminer up to 5.4.x. This issue affects an unknown code. The manipulation of the argument X-Forwarded-Prefix/REQUEST_URI with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Impacted is integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-34959 since 03/31/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1204.001 according to MITRE ATT&CK.

Upgrading to version 5.5.0 eliminates this vulnerability.

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Productinfo

Vendor

• Vrana

Name

• Adminer

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4

Website

• Product: https://github.com/vrana/adminer/

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