CVE-2026-25923

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.

Score

CVSS 3.1 9.1 Critical

Status

Analyzed - security-advisories@github.com

Published

2026-02-09

Last modified

2026-02-11

Weaknesses

CWE-434, CWE-502

Affected products

• Mylittleforum (My-little-forum)
• My Little Forum (Mylittleforum)

References

• https://github.com/My-Little-Forum/mylittleforum/releases/tag/20260208.1
• https://github.com/My-Little-Forum/mylittleforum/security/advisories/GHSA-wr9p-3c3g-78fw