{"id":"CVE-2026-71981","summary":"Cypht \u003c 2.12.2 PHP Object Injection RCE via back_query Parameter","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.","modified":"2026-09-04T03:30:21.223043537Z","published":"2026-09-01T20:43:08.844Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71981.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-502"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71981.json"},{"type":"ADVISORY","url":"https://github.com/cypht-org/cypht/releases/tag/v2.12.2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71981"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/cypht-php-object-injection-rce-via-back-query-parameter"},{"type":"REPORT","url":"https://github.com/cypht-org/cypht/pull/2073"},{"type":"FIX","url":"https://github.com/cypht-org/cypht/commit/e4aa2f34e33f9328e8c93514cc3966fc3d99925e"},{"type":"PACKAGE","url":"https://github.com/cypht-org/cypht"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cypht-org/cypht","events":[{"introduced":"0"},{"fixed":"fbaf979c3740a6e0f72e3a6c96e4a5102aae2133"},{"fixed":"e4aa2f34e33f9328e8c93514cc3966fc3d99925e"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.12.2"}],"source":["DESCRIPTION","REFERENCES"]}}],"versions":["v2.12.0","v2.11.0","v2.5.0","v2.2.0","v2.1.0","v2.0.1","v2.0.0","v1.3.0-rc1","v1.1.0-rc1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71981.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}