CVE-2025-43960: Adminer

High severity, CVSS 8.6. EPSS: 0.7% chance of exploitation in the next 30 days.

Adminer 4.8.1, when using Monolog for logging, allows a Denial of Service (memory consumption) via a crafted serialized payload (e.g., using s:1000000000), leading to a PHP Object Injection issue. Remote, unauthenticated attackers can trigger this by sending a malicious serialized object, which forces excessive memory usage, rendering Adminer’s interface unresponsive and causing a server-level DoS. While the server may recover after several minutes, multiple simultaneous requests can cause a complete crash requiring manual intervention.

Affected products

• Adminer Adminer: version 4.8.1 only

Published 2025-08-25. Last modified 2026-06-17.