EUVD-2026-72866
GHSA-j4wp-xfvq-c8f7
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-accessible control panel, low-complexity exploit, any authenticated panel user (PR:L), no user interaction; arbitrary code execution yields full C/I/A impact within the application scope.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
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 elements as JSON strings to bypass cleanse validation, then trigger arbitrary object instantiation and code execution through Craft::createObject().
AnalysisAI
Remote code execution in Craft CMS before 5.10.12 is achievable by any authenticated control-panel user through Yii2 behavior injection. The vulnerability arises because string-typed field-layout elements are not properly cleansed before processing, allowing attackers to embed Yii2 behavior attachments and event handlers in JSON-formatted field-layout tab submissions that bypass validation and reach Craft::createObject(), instantiating arbitrary PHP objects and executing attacker-controlled code. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid Craft CMS control-panel account at any privilege level (PR:L per CVSS 4.0 vector) - editor and author roles are sufficient, with no administrator access needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:L/UI:N) reflects a high-severity flaw with a low but present barrier: any authenticated control-panel user can trigger it without admin privileges. … 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 version 5.10.12 or later immediately, as documented in GitHub Security Advisory GHSA-qj4v-m29p-fj4m at https://github.com/craftcms/cms/security/advisories/GHSA-qj4v-m29p-fj4m. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, verify your Craft CMS version (check Settings > About or config/general.php) and audit all active control-panel user accounts for necessity and permission scope. …
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Same weakness CWE-94 – Code Injection
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External POC / Exploit Code
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