{"id":"CVE-2026-71981","title":"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 ha…","summary":"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 ha…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-502"],"published":"2026-09-01","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:18:59.270","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-71981","references":[{"url":"https://github.com/cypht-org/cypht/commit/e4aa2f34e33f9328e8c93514cc3966fc3d99925e","label":"disclosure@vulncheck.com"},{"url":"https://github.com/cypht-org/cypht/pull/2073","label":"disclosure@vulncheck.com"},{"url":"https://github.com/cypht-org/cypht/releases/tag/v2.12.2","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/cypht-php-object-injection-rce-via-back-query-parameter","label":"disclosure@vulncheck.com"}],"tags":["nvd","exploit-available"],"epss":0.00565,"epssPercentile":0.45459,"exploits":{"github":1,"githubRepos":["https://github.com/lyn4r/CVE-2026-71981"],"checkedAt":"2026-09-21T15:30:24.159Z"},"exploitAvailable":true,"ingestedAt":"2026-09-08T21:11:12.289Z","slug":"CVE-2026-71981","body":"## Overview\n\nCypht 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":61,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}