Vulnerability · Published Aug 25, 2026 · Assigned by VulnCheck
CVE-2026-34964Adminer before 5.5.0 SSRF via PDO DSN Injection
Medium 5.8
In plain English
A medium-severity server-side request forgery in adminer from vrana. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | adminer | no fix listed | DEBIAN-CVE-2026-34964 |
| Debian:13 | adminer | no fix listed | DEBIAN-CVE-2026-34964 |
| Debian:14 | adminer | 6.0.0-1 | DEBIAN-CVE-2026-34964 |
| Ubuntu:22.04:LTS | adminer | no fix listed | UBUNTU-CVE-2026-34964 |
| Ubuntu:24.04:LTS | adminer | no fix listed | UBUNTU-CVE-2026-34964 |
| Ubuntu:26.04:LTS | adminer | no fix listed | UBUNTU-CVE-2026-34964 |
Affected products (as reported)
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
References
- GitHub Security Advisory (GHSA-58cq-mgw2-38m5) vendor-advisory
- VulnCheck Advisory: Adminer before 5.5.0 SSRF via PDO DSN Injection third-party-advisory