CVE CVE-2026-25923

CVE-2026-25923

PHP

Severity: CRITICAL
CVSS: 9.1CVSS
Published: 2026-02-09
Last modified: 2026-03-17
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CWE: CWE-434CWE-502

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.

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

Summary

Description

References