Description
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.
Problem types
CWE-434: Unrestricted Upload of File with Dangerous Type
CWE-502: Deserialization of Untrusted Data
Product status
References
github.com/...eforum/security/advisories/GHSA-wr9p-3c3g-78fw
github.com/...le-Forum/mylittleforum/releases/tag/20260208.1