Vulnerability Report

CVE-2026-25892

Title: Adminer Adminer Input Validation Error

Input Validation Error

Proof Of Concept

PoC Available for CVE-2026-25892

CWE Category CWE-20

Published Date Feb 09, 2026

Modified Date Feb 20, 2026

Exploit Status Available

Score 7.5 CVSS v3.1

Exploit Probability (EPSS)

4.46%

Vulnerability Summary

CVE-2026-25892: Adminer is open-source database management software. Adminer v5.4.1 and earlier has a version check mechanism where adminer.org sends signed version info via JavaScript postMessage, which the browser then POSTs to ?script=version. This endpoint lacks origin validation and accepts POST data from any source. An attacker can POST version[] parameter which PHP converts to an array. On next page load, openssl_verify() receives this array instead of string and throws TypeError, returning HTTP 500 to all users. Upgrade to Adminer 5.4.2.

Impacted Vendors

adminer 1

Reference Links

https://github.com/vrana/adminer/commit/21d3a3150388677b18647d68aec93b7850e457d3 https://github.com/vrana/adminer/releases/tag/v5.4.2 https://github.com/vrana/adminer/security/advisories/GHSA-q4f2-39gr-45jh

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns