{"id":"CVE-2026-81901","title":"In Concrete CMS 9.2.0 through 9.5.2, the REST API page update endpoint (PUT /ccm/api/1.0/pages/{cID}) did not enforce page-property, page-template, or page-type authorization","summary":"In Concrete CMS 9.2.0 through 9.5.2, the REST API page update endpoint (PUT /ccm/api/1.0/pages/{cID}) did not enforce page-property, page-template, or page-type authorization. A user granted only content-editing rights on a page could th…","severity":"high","cvss":8.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","cwe":["CWE-862"],"vendor":"concretecms","product":"concrete_cms","affected":["concrete_cms >= 9.2.0, < 9.5.3"],"patched":["concrete_cms 9.5.3"],"published":"2026-09-14","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:17:29.047","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81901","references":[{"url":"https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes","label":"ff5b8ace-8b95-4078-9743-eac1ca5451de"}],"tags":["nvd","cve.org"],"epss":0.00284,"epssPercentile":0.21199,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-15T14:23:29.199682Z"},"scores":{"nvd":8.7,"cna":7.2},"ingestedAt":"2026-09-14T21:15:17.559Z","slug":"CVE-2026-81901","body":"## Overview\n\nIn Concrete CMS 9.2.0 through 9.5.2, the REST API page update endpoint (PUT /ccm/api/1.0/pages/{cID}) did not enforce page-property, page-template, or page-type authorization. A user granted only content-editing rights on a page could therefore alter its properties, template, and type through the API, and could set the header_extra_content attribute, which is rendered unescaped into the head element of every page, to persist JavaScript that executed in the browser of every visitor, including higher-privileged reviewers who approve the page version. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.2 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai for reporting.\n\n## Affected\n\n- `concrete_cms >= 9.2.0, < 9.5.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `concrete_cms 9.5.3`","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":207465,"id":"CVE-2026-81901","ts":1789761016377,"field":"cvss","old":"7.2","new":"8.7"}]}