PHP
CVE-2026-25923
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Lifecycle Timeline
2DescriptionGitHub Advisory
my little forum is a PHP and MySQL based internet forum that displays the messages in classical threaded view. Prior to 20260208.1, the application fails to filter the phar:// protocol in URL validation, allowing attackers to upload a malicious Phar Polyglot file (disguised as JPEG) via the image upload feature, trigger Phar deserialization through BBCode [img] tag processing, and exploit Smarty 4.1.0 POP chain to achieve arbitrary file deletion. This vulnerability is fixed in 20260208.1.
AnalysisAI
my little forum PHP forum software has an unrestricted file upload allowing authenticated users to upload dangerous file types.
Technical ContextAI
CWE-434 unrestricted file upload in the my little forum software.
RemediationAI
Update the software. Implement file type validation.
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Same technique Deserialization
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External POC / Exploit Code
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