{"id":"CVE-2026-91939","summary":"Cotonti 1.0.0 Comments Plugin PHP Object Injection via ci Parameter","details":"Cotonti 1.0.0 Comments plugin passes the ci GET parameter to unserialize() without allowed_classes restriction, allowing unauthenticated attackers to instantiate arbitrary PHP classes with attacker-controlled properties. Attackers can exploit PHP object injection through crafted serialized payloads to trigger gadget chains and achieve database manipulation or code execution.","modified":"2026-09-18T03:30:22.959845022Z","published":"2026-09-15T20:56:45.058Z","database_specific":{"cwe_ids":["CWE-502"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91939.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91939.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91939"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/cotonti-1.0.0-comments-plugin-php-object-injection-via-ci-parameter"},{"type":"REPORT","url":"https://github.com/Cotonti/Cotonti/issues/1888"},{"type":"FIX","url":"https://github.com/Cotonti/Cotonti/pull/1889"},{"type":"PACKAGE","url":"https://github.com/Cotonti/Cotonti"},{"type":"ARTICLE","url":"https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/comments.setup.php"},{"type":"ARTICLE","url":"https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/controllers/actions/DisplayAction.php"},{"type":"ARTICLE","url":"https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/inc/CommentsWidget.php"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cotonti/cotonti","events":[{"introduced":"0d554e939a315e7f7f18fba3ca1132b80c6a1adb"},{"last_affected":"0d554e939a315e7f7f18fba3ca1132b80c6a1adb"}],"database_specific":{"extracted_events":[{"introduced":"1.0.0"},{"last_affected":"1.0.0"}],"source":"AFFECTED_FIELD"}}],"versions":["1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91939.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}