{"id":"CVE-2026-71981","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-71981","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…","details":"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.","published":"2026-09-01T21:18:36.310","modified":"2026-09-01T21:18:36.310","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/cypht-org/cypht/commit/e4aa2f34e33f9328e8c93514cc3966fc3d99925e","label":"cypht-org/cypht@e4aa2f3"},"references":[{"type":"WEB","url":"https://github.com/cypht-org/cypht/commit/e4aa2f34e33f9328e8c93514cc3966fc3d99925e"},{"type":"WEB","url":"https://github.com/cypht-org/cypht/pull/2073"},{"type":"WEB","url":"https://github.com/cypht-org/cypht/releases/tag/v2.12.2"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/cypht-php-object-injection-rce-via-back-query-parameter"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-01T21:18:36.310"}}