CVE-2026-34964

Description

Adminer before 5.5.0 contains a server-side request forgery vulnerability in the login form's server field validator, which only inspects leading integers for privileged ports and fails to reject non-numeric port values. Attackers can inject PDO DSN keys like host= and port= into the server parameter to bypass the privileged-port restriction and establish TCP connections to arbitrary internal hosts and ports before authentication.

CVSS Vector

References

• https://github.com/vrana/adminer/security/advisories/GHSA-58cq-mgw2-38m5
• https://www.vulncheck.com/advisories/adminer-before-ssrf-via-pdo-dsn-injection