CVE-2026-25892
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Adminer
PublishedFeb 9, 2026
First seenFeb 9, 2026
Weakness typeCWE-20Improper input validation
How to fix
Update
- adminer adminer5.4.2 or later
- vrana/adminer5.4.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| adminer adminer | 4.6.2 ≤ v < 5.4.2 | 5.4.2 |
| vrana/adminerPackagist | 4.6.2 ≤ v < 5.4.2 | 5.4.2 |
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