{"id":"CVE-2026-81926","title":"Concrete CMS 9.4.0 through 9.5.2 did not escape colliding page paths before rendering them in the location panel's duplicate-path confirmation dialog","summary":"Concrete CMS 9.4.0 through 9.5.2 did not escape colliding page paths before rendering them in the location panel's duplicate-path confirmation dialog. The panel's check endpoint returned the submitted path unmodified in its JSON response…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-79"],"vendor":"concretecms","product":"concrete_cms","affected":["concrete_cms >= 9.4.0, < 9.5.3"],"patched":["concrete_cms 9.5.3"],"published":"2026-09-15","updated":"2026-09-21","sourceUpdated":"2026-09-21T17:53:00.563","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81926","references":[{"url":"https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes","label":"ff5b8ace-8b95-4078-9743-eac1ca5451de"}],"tags":["nvd","cve.org","score-dispute"],"epss":0.00183,"epssPercentile":0.08156,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-16T17:49:08.178394Z"},"scores":{"nvd":6.1,"cna":2},"ingestedAt":"2026-09-15T20:44:02.616Z","slug":"CVE-2026-81926","body":"## Overview\n\nConcrete CMS 9.4.0 through 9.5.2 did not escape colliding page paths before rendering them in the location panel's duplicate-path confirmation dialog. The panel's check endpoint returned the submitted path unmodified in its JSON response, and client-side JavaScript inserted each value into the dialog as raw HTML, so a crafted page path executed script in the editor's authenticated browser session. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.0 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai for reporting.\n\n## Affected\n\n- `concrete_cms >= 9.4.0, < 9.5.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `concrete_cms 9.5.3`","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208693,"id":"CVE-2026-81926","ts":1790016697909,"field":"cvss","old":"2","new":"6.1"},{"seq":208692,"id":"CVE-2026-81926","ts":1790016697909,"field":"severity","old":"low","new":"medium"}]}