EUVD-2026-81293
GHSA-9v9g-4j69-p6q5
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
Network-reachable low-complexity attack; PR:L because a low-privilege CP account with element edit rights is required; arbitrary PHP execution yields full C/I/A impact.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
5DescriptionCVE.org
Craft CMS versions 5.10.0 through 5.10.12 contain an incomplete fix for CVE-2026-55794: the Controller::getPostedRedirectUrl() -> View::renderObjectTemplate() sink remained unsandboxed, and the same fix commit added a self-signing oracle in Cp::elementLabelHtml(). Because Craft/Yii HMAC tokens are not bound to a parameter name, an authenticated low-privilege control panel user with edit rights on a single element type can mint a token over attacker-controlled Twig for the returnUrl parameter and replay it as the redirect POST parameter, reaching the unsandboxed sink and achieving server-side template injection that executes arbitrary PHP code (full server compromise). The issue is fixed in 5.10.13.
AnalysisAI
Server-side template injection in Craft CMS 5.10.0 through 5.10.12 allows an authenticated low-privilege control-panel user with edit rights on even a single element type to execute arbitrary PHP code and fully compromise the server. The bug is an incomplete fix for CVE-2026-55794: the Controller::getPostedRedirectUrl() to View::renderObjectTemplate() redirect sink stayed unsandboxed, and the same patch introduced a self-signing oracle in Cp::elementLabelHtml(); because Craft/Yii HMAC tokens are not bound to a parameter name, a token minted over attacker-controlled Twig for returnUrl can be replayed as the redirect POST parameter. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated Craft CMS control-panel account with edit rights on at least one element type (PR:L) - not anonymous or default-public. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue, not a high-CVSS-but-low-real-risk case. … 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 5.10.13 or later; this is the only complete fix, because a single release addresses both the unsandboxed getPostedRedirectUrl() to renderObjectTemplate() sink and the HMAC signing oracle in Cp::elementLabelHtml(), and vendor-released patch version 5.10.13 should be applied via your normal Composer/Docker image update path, followed by verification in Settings that the running version reports 5.10.13 or higher. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every Craft CMS deployment and identify all instances running 5.10.0 through 5.10.12; apply the vendor-released patch, Craft CMS 5.10.13, to any internet-facing installation first, and where patching cannot be completed immediately, temporarily restrict control-panel access to trusted networks or disable it entirely. …
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External POC / Exploit Code
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