{"id":"CVE-2026-18423","title":"Concrete CMS 9.0.0 through 9.5.2 is vulnerable to Insecure direct object reference (IDOR)  in the Express saved search preset delete and edit dialogs ","summary":"Concrete CMS 9.0.0 through 9.5.2 is vulnerable to Insecure direct object reference (IDOR)  in the Express saved search preset delete and edit dialogs . An authenticated user holding only view permission on a single Express entity could t…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","cwe":["CWE-639"],"vendor":"concretecms","product":"concrete_cms","affected":["concrete_cms >= 9.0.0, < 9.5.3"],"patched":["concrete_cms 9.5.3"],"published":"2026-09-15","updated":"2026-09-21","sourceUpdated":"2026-09-21T17:50:42.470","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-18423","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":0.00246,"epssPercentile":0.14105,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-15T19:42:54.758501Z"},"scores":{"nvd":7.1,"cna":2.1},"ingestedAt":"2026-09-15T19:42:58.817Z","slug":"CVE-2026-18423","body":"## Overview\n\nConcrete CMS 9.0.0 through 9.5.2 is vulnerable to Insecure direct object reference (IDOR)  in the Express saved search preset delete and edit dialogs . An authenticated user holding only view permission on a single Express entity could therefore permanently delete, with no undo, or rename saved search presets owned by Express entities for which they had no permission, and a renamed preset name was displayed back to users of the targeted entity, enabling defacement or social engineering. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N. Thanks Yalguun Tumenkhuu ( fg0x0 ) 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":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208684,"id":"CVE-2026-18423","ts":1790016693151,"field":"cvss","old":"2.1","new":"7.1"},{"seq":208683,"id":"CVE-2026-18423","ts":1790016693151,"field":"severity","old":"low","new":"high"}]}