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baserCMS Path Traversal Leads to Arbitrary File Write and RCE via Theme File API

🗓️ 31 Mar 2026 22:47:39Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 5 Views

Path traversal in baserCMS 5.x theme file API lets authenticated admins write PHP files outside the theme and trigger RCE.

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31 Mar 2026 22:47Current
8High risk
Vulners AI Score8
CVSS 3.17.2
EPSS0.01049
SSVC
5