What’s Vulnerable › Vulnerabilities

CVE-2026-34964: Adminer before 5.5.0 SSRF via PDO DSN Injection

• Severity: medium (CVSS 5.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-25 · updated 2026-10-12
• Weakness: CWE-918

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.

Affected products

• vrana adminer: before 5.5.0 — fixed in 5.5.0

How to fix

Upgrade to a fixed version: vrana adminer 5.5.0. Check the vendor advisory for mitigations.

References

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

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