EUVD-2026-39442
GHSA-hmpj-wp8r-7h2p
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Primary rating from Vendor (Joomla) · only source for this CVE.
CVSS VectorVendor: Joomla
Lifecycle Timeline
4DescriptionCVE.org
The K2 frontend article-attachment upload path accepts files whose extension is .php, and Apache's standard mod_php matches \.php$ and executes them under the K2 web user. A K2 Author can upload a shell.php, then fetch /media/k2/attachments/shell.php and execute arbitrary PHP code in the web server's context.
AnalysisAI
Unrestricted PHP file upload in K2 extension for Joomla (versions 1.0–2.26) enables any authenticated K2 Author to achieve remote code execution by uploading a PHP webshell via the frontend article-attachment upload endpoint and executing it through Apache mod_php. Because the upload handler performs no extension filtering, a .php file is written to /media/k2/attachments/ and served by Apache's standard \.php$ handler, executing arbitrary code as the web server process user. No public exploit has been identified at time of analysis and the vulnerability is not listed in CISA KEV, though the attack path is elementary once Author-level access is obtained.
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Same technique File Upload
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External POC / Exploit Code
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