{"id":"CVE-2026-86730","title":"Craft CMS versions before 5.10.12 fail to properly cleanse string-typed field-layout elements, allowing authenticated control-panel users to inject Yii2 behavior attachments and event handlers","summary":"Craft CMS versions before 5.10.12 fail to properly cleanse string-typed field-layout elements, allowing authenticated control-panel users to inject Yii2 behavior attachments and event handlers. Attackers can post field-layout tab element…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-94"],"vendor":"craftcms","product":"cms","affected":["cms >= 5.0.0-RC1 < 5.10.12"],"published":"2026-09-08","updated":"2026-09-08","sourceUpdated":"2026-09-08T19:53:13.400","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86730","references":[{"url":"https://github.com/craftcms/cms/security/advisories/GHSA-qj4v-m29p-fj4m","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/craft-cms-5.0.0-rc1-before-5.10.12-behavior-injection-rce","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-08T15:36:07.413468Z"},"ingestedAt":"2026-09-08T15:33:26.987Z","epss":0.00393,"epssPercentile":0.3324,"slug":"CVE-2026-86730","body":"## Overview\n\nCraft CMS versions before 5.10.12 fail to properly cleanse string-typed field-layout elements, allowing authenticated control-panel users to inject Yii2 behavior attachments and event handlers. Attackers can post field-layout tab elements as JSON strings to bypass cleanse validation, then trigger arbitrary object instantiation and code execution through Craft::createObject().\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}