CVE-2026-115938
CVE-2026-115938 · Low privilege condition filter escapes Twig sandbox, recovers "securityKey" and reaches RCE
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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 ArrayHelper, outside Twig’s SecurityPolicy. Repeated single-segment lookups therefore bypass the sandbox’s empty property/method allowlists. The 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. After 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.
CVSS 8.7 · Élevée · EPSS 0,4% · Correctif disponible
- Publication
- Mise à jour
Produits et versions concernés
cms
- Versions du logiciel
- ≥ 5.0.0, < 5.11.2: Concernée (semver)
- ≥ 4.0.0, < 4.18.9: Concernée (semver)
Mettez à jour vers 4.18.9; Mettez à jour vers 5.11.2