CVE-2026-71981 — Cypht < 2.12.2 PHP Object Injection RCE via back_query Parameter
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 o…
Published: 2026-09-01 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7