---
id: CVE-2026-34964
title: >-
  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
summary: >-
  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 in…
severity: medium
cvss: 5.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N'
cwe:
  - CWE-918
published: '2026-08-25'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:23:49.880'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34964'
references:
  - url: 'https://github.com/vrana/adminer/security/advisories/GHSA-58cq-mgw2-38m5'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/adminer-before-ssrf-via-pdo-dsn-injection
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00434
epssPercentile: 0.35085
ingestedAt: '2026-09-08T21:11:12.285Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.