CVE-2026-25923
CRITICAL WAF: Medium
CVSS 9.1
Published: 2026-02-09
CWE-434 CWE-502
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.
WAF Coverage Analysis
Unrestricted File Upload
Medium WAF Coverage
OWASP: A04:2021 Insecure Design
930xxx - Local File Inclusion
Insecure Deserialization
Medium WAF Coverage
OWASP: A08:2021 Software and Data Integrity Failures
944xxx - Java Attack
Affected Software
| Vendor | Product | Version |
|---|---|---|
| mylittleforum | my_little_forum | up to 20260208.1 |
References
- github.com (Product, Release Notes)
- github.com (Exploit, Mitigation, Vendor Advisory)