EUVD-2026-81292
GHSA-24f9-r76v-62p8
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Remote low-priv authenticated user (PR:L, no CP rights needed) triggers RCE with low complexity on default config; runs as web-server user on the same system so S:U with full C/I/A impact.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
6DescriptionCVE.org
Craft CMS 4.8.0 through 4.18.5 and 5.0.0 through 5.10.12 sign an authenticated user's attacker-controlled license-shun cookie with the same key and format used to validate signed redirect parameters, because the HMAC signature is not bound to its purpose (Yii's cookieValidationKey is derived from the same Craft securityKey used for signed request parameters). An authenticated, non-administrator user (Control Panel access is not required) can set the cookie via the license-shun endpoint and transplant the signed envelope into the redirect parameter; on a successful login, Craft validates the signature and renders the authenticated bytes as an unsandboxed Twig template, where Twig's map filter accepts a string callback and allows PHP system() to execute arbitrary operating-system commands as the web-server user. Exploitation requires an account using password authentication without active 2FA, the default request configuration, and availability of PHP system(). The issue is fixed in 4.18.6 and 5.10.13.
AnalysisAI
Remote code execution in Craft CMS 4.8.0 through 4.18.5 and 5.0.0 through 5.10.12 lets any authenticated non-administrator user - Control Panel access is not required - run arbitrary operating-system commands as the web-server user. Craft signs the attacker-controlled license-shun cookie with the same key and format it uses to validate signed redirect parameters (the signature is not bound to its purpose), so the attacker can transplant that signed envelope into the login redirect parameter; on a successful login Craft accepts the signature and renders the attacker-supplied bytes as an unsandboxed Twig template, where Twig's map filter accepts a string callback and reaches PHP system(). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated Craft user account (Control Panel/admin rights NOT required - any non-administrator front-end account suffices) that uses password authentication WITHOUT active two-factor authentication. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority vulnerability, not a high-CVSS-but-low-real-risk issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Craft CMS to 4.18.6 (4.x train) or 5.10.13 (5.x train) - these are the vendor-released fixed versions - and confirm the running build after deployment; the vendor advisory GHSA-5r92-75j8-c534 documents the correction. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Craft CMS instances and upgrade any deployment running 4.8.0 through 4.18.5 to 4.18.6 or any deployment running 5.0.0 through 5.10.12 to 5.10.13; if immediate upgrade is not possible, enforce 2FA for all user accounts, disable unused non-administrator accounts, and disable PHP system() via php.ini where feasible. …
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External POC / Exploit Code
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