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 (2)
Core 2
Core References
Vendor Advisory x_refsource_confirm
https://github.com/My-Little-Forum/mylittleforum/security/advisories/GHSA-wr9p-3c3g-78fw
Release Notes x_refsource_misc
https://github.com/My-Little-Forum/mylittleforum/releases/tag/20260208.1
Scores
CVSS v3
9.1
EPSS
0.0043
EPSS Percentile
34.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-434
CWE-502
Status
published
Products (2)
My-Little-Forum/mylittleforum
< 20260208.1
mylittleforum/my_little_forum
< 20260208.1
Published
Feb 09, 2026
Tracked Since
Feb 18, 2026