CVE-2026-34964: Server-Side Request Forgery (SSRF) in vrana adminer
Description
Adminer versions prior to 5.5.0 contain a server-side request forgery (SSRF) vulnerability in the login form's server field validator. The validator incorrectly inspects only leading integers for privileged ports and fails to reject non-numeric port values. This flaw allows attackers to inject PDO DSN keys such as host= and port= into the server parameter, bypassing privileged-port restrictions and enabling TCP connections to arbitrary internal hosts and ports before authentication.
CVSS v4.0
Score 6.9medium
Affected software
vrana
adminer
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-34964 is a server-side request forgery vulnerability affecting Adminer before version 5.5.0. The vulnerability arises from improper validation in the login form's server field, where only leading integers are checked for privileged ports, allowing non-numeric port values to bypass restrictions. Attackers can exploit this by injecting PDO DSN keys (e.g., host= and port=) into the server parameter, enabling them to establish TCP connections to arbitrary internal hosts and ports without authentication.
Potential Impact
An attacker can leverage this vulnerability to perform SSRF attacks, potentially accessing internal network resources by establishing TCP connections to arbitrary hosts and ports within the internal network before authentication. This may lead to unauthorized access or information disclosure depending on the internal services accessible via these connections.
Mitigation Recommendations
A fix is available in Adminer version 5.5.0. Users should upgrade to version 5.5.0 or later to remediate this vulnerability. No additional mitigation guidance is provided in the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-03-31T17:58:43.754Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a8cf578acd9273b4984284a
Added to database: 08/25/2026, 01:52:56 UTC
Last enriched: 09/10/2026, 20:47:48 UTC
Last updated: 10/08/2026, 06:48:16 UTC
Views: 39
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