{"id":"CVE-2026-81902","title":"Concrete CMS 9 through 9.5.2 did not validate a CSRF token in the orphaned block removal panel action (removeOrphanedBlocks)","summary":"Concrete CMS 9 through 9.5.2 did not validate a CSRF token in the orphaned block removal panel action (removeOrphanedBlocks). A remote attacker could craft a request that, when loaded by an authenticated user holding edit permission on t…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H","cwe":["CWE-352"],"vendor":"concretecms","product":"concrete_cms","affected":["concrete_cms >= 9.0.0, < 9.5.3"],"patched":["concrete_cms 9.5.3"],"published":"2026-09-14","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:13:05.493","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81902","references":[{"url":"https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes","label":"ff5b8ace-8b95-4078-9743-eac1ca5451de"}],"tags":["nvd","cve.org"],"epss":0.00156,"epssPercentile":0.05148,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-15T14:23:51.380448Z"},"scores":{"nvd":8.1,"cna":7.1},"ingestedAt":"2026-09-14T21:15:17.560Z","slug":"CVE-2026-81902","body":"## Overview\n\nConcrete CMS 9 through 9.5.2 did not validate a CSRF token in the orphaned block removal panel action (removeOrphanedBlocks). A remote attacker could craft a request that, when loaded by an authenticated user holding edit permission on the target page, deleted every block on that page's current version; blocks not aliased to another page or scrapbook entry were also removed from the global Blocks table and their block-type data table, permanently destroying the content. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.1 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai for reporting.\n\n## Affected\n\n- `concrete_cms >= 9.0.0, < 9.5.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `concrete_cms 9.5.3`","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":207466,"id":"CVE-2026-81902","ts":1789761016559,"field":"cvss","old":"7.1","new":"8.1"}]}