CVE-2026-34964
Received Received - Intake

Adminer Server-Side Request Forgery Before 5.5.0

Publication date: 2026-08-25

Last updated on: 2026-08-25

Assigner: VulnCheck

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 Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-25
Last Modified
2026-08-25
Generated
2026-08-25
AI Q&A
2026-08-25
EPSS Evaluated
N/A
NVD
CVE-2026-34964
EUVD
EUVD-2026-65197

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
vrana adminer to 5.5.0 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

CVE-2026-34964 is a pre-authentication Server-Side Request Forgery (SSRF) vulnerability in Adminer versions 5.4.4 and earlier. It occurs due to improper validation of the server field in the login form. The validator only checks if the port starts with an integer outside the valid range, allowing non-numeric port values to bypass restrictions. Attackers can inject PDO DSN keys like host= and port= into the server parameter to override validated host values, enabling connections to arbitrary internal hosts and ports before authentication.

Detection Guidance

To detect this vulnerability, check if Adminer versions 5.4.4 or earlier are installed on your system. Inspect network traffic for unusual connections originating from Adminer instances, particularly to internal hosts or privileged ports. Monitor logs for failed authentication attempts or unexpected PDO DSN injection patterns in server parameters.

Impact Analysis

This vulnerability allows unauthenticated attackers to perform internal port scans, connect to internal services like MySQL/MariaDB instances, or establish arbitrary TCP connections to internal hosts and ports. It can also lead to unauthorized SSRF, internal network reconnaissance, and potential access to internal databases. The impact includes compromised network security and unauthorized data access.

Compliance Impact

This SSRF vulnerability could lead to unauthorized access to internal systems, potentially exposing sensitive data. For GDPR, this may violate Article 32 requirements for data security and integrity. For HIPAA, it could compromise protected health information by allowing unauthorized network access to databases.

Mitigation Strategies

Immediately upgrade Adminer to version 5.5.0 or later to patch the vulnerability. If upgrading is not possible, restrict network access to Adminer instances to trusted sources only. Disable or remove Adminer if it is not required. Monitor for any suspicious activity or unauthorized connections.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-34964. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart