{"id":"CVE-2026-93872","title":"Cotonti 1.0.0 passes the base64-decoded cb parameter to unserialize() without allowed_classes restriction in the comments plugin EditAction","summary":"Cotonti 1.0.0 passes the base64-decoded cb parameter to unserialize() without allowed_classes restriction in the comments plugin EditAction. Registered users with comment write permissions can instantiate arbitrary PHP objects and potent…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-502"],"vendor":"Cotonti","product":"Cotonti","affected":["Cotonti >= 1.0.0 <= 1.0.0"],"published":"2026-09-18","updated":"2026-09-21","sourceUpdated":"2026-09-21T21:17:19.993","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93872","references":[{"url":"https://github.com/Cotonti/Cotonti","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/controllers/actions/EditAction.php","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Cotonti/Cotonti/blob/1.0.0/system/cache.php","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Cotonti/Cotonti/issues/1894","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Cotonti/Cotonti/pull/1897","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/cotonti-1.0.0-php-object-injection-via-comments-plugin-edit-action-cb-parameter","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-21T16:42:41.893793Z"},"epss":0.00439,"epssPercentile":0.3751,"ingestedAt":"2026-09-18T20:51:25.689Z","slug":"CVE-2026-93872","body":"## Overview\n\nCotonti 1.0.0 passes the base64-decoded cb parameter to unserialize() without allowed_classes restriction in the comments plugin EditAction. Registered users with comment write permissions can instantiate arbitrary PHP objects and potentially achieve file write or code execution through gadget chains.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}