{"id":"CVE-2026-115938","title":"Low privilege condition filter escapes Twig sandbox, recovers \"securityKey\" and reaches RCE","summary":"Craft CMS allows any authenticated control panel user to submit an element-search condition whose element selector is evaluated as a sandboxed Twig object template. Craft’s allowed column filter delegates property lookup to Yii ArrayHelp…","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","cvssSource":"cna","cwe":["CWE-1336"],"vendor":"craftcms","product":"craftcms/cms","affected":["craftcms/cms >= 5.0.0 < 5.11.2","craftcms/cms >= 4.0.0 < 4.18.9"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T21:58:51.816Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115938","references":[{"url":"https://www.hckrt.com/hacktivity/HCKRT-DRNL9W"},{"url":"https://github.com/craftcms/cms/releases/tag/5.11.2"},{"url":"https://github.com/craftcms/cms"},{"url":"https://github.com/craftcms/cms/security/advisories/GHSA-v4q3-2g5g-wjj6"}],"tags":["cve.org"],"ingestedAt":"2026-10-24T00:46:53.879Z","slug":"CVE-2026-115938","body":"## Overview\n\nCraft CMS allows any authenticated control panel user to submit an element-search condition whose element selector is evaluated as a sandboxed Twig object template. Craft’s allowed column filter delegates property lookup to Yii ArrayHelper, outside Twig’s SecurityPolicy. Repeated single-segment lookups therefore bypass the sandbox’s empty property/method allowlists.\n\n\n\nThe vulnerable condition value is ultimately cast to an integer. That does not protect the secret: the template can return author ID 1 when a guessed key character is correct and an impossible ID otherwise. The JSON endpoint returns entries for the first case and an empty array for the second, forming a stable remote character oracle.\n\n\n\nAfter recovering GeneralConfig::securityKey, the same user can compute Craft’s generic HMAC wire format offline. Signed parameters such as redirect are then accepted and passed to unsandboxed View::renderObjectTemplate(), where Twig’s string-callable form can invoke native PHP callables. The regression proof uses the harmless substr() callback and observes abcdef becoming cdef; it does not execute an OS command.\n\n## Affected\n\n- `craftcms/cms >= 5.0.0 < 5.11.2`\n- `craftcms/cms >= 4.0.0 < 4.18.9`\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,"exploitation":0,"ransomware":0},"changes":[]}