CVE-2026-71981: Cypht-Org Cypht

High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days.

Cypht before 2.12.2 contains a PHP object injection vulnerability that allows authenticated attackers to execute arbitrary operating system commands by supplying a crafted PHP object graph in the back_query GET parameter of the logout handler. Attackers can pass a base64-encoded serialized payload through this parameter, which is decoded and passed directly to unserialize() without an allow-list, signature check, or type restriction, enabling gadget-chain exploitation to achieve remote code execution as the web server process.

Affected products

• Cypht-Org Cypht: before 2.12.2 (fixed in 2.12.2)

Published 2026-09-01. Last modified 2026-09-08.