Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mylittleforum | My Little Forum | < 20260208.1 |
Related Weaknesses (CWE)
References
- https://github.com/My-Little-Forum/mylittleforum/releases/tag/20260208.1ProductRelease Notes
- https://github.com/My-Little-Forum/mylittleforum/security/advisories/GHSA-wr9p-3ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-25923?
CVE-2026-25923 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 validati...
How severe is CVE-2026-25923?
CVE-2026-25923 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-25923?
Check the references section above for vendor advisories and patch information. Affected products include: Mylittleforum My Little Forum.