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Craft CMS vulnerable to potential authenticated Remote Code Execution via malicious attached Behavior

🗓️ 05 Jan 2026 18:50:14Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 10 Views

Craft CMS authenticated RCE via malicious Behavior; admin access; update to 5.8.21 and 4.16.17.

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06 Jan 2026 15:52Current
8.7High risk
Vulners AI Score8.7
CVSS 3.17.2
CVSS 48.6
EPSS0.00899
SSVC
10