Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/cypht-org/cypht/commit/e4aa2f34e33f9328e8c93514cc3966fc3d9992
- https://github.com/cypht-org/cypht/pull/2073
- https://github.com/cypht-org/cypht/releases/tag/v2.12.2
- https://www.vulncheck.com/advisories/cypht-php-object-injection-rce-via-back-que
FAQ
What is CVE-2026-71981?
CVE-2026-71981 is a vulnerability with a CVSS score of 8.8 (HIGH). 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...
How severe is CVE-2026-71981?
CVE-2026-71981 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-71981?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.