CVE-2026-25923

Phar Deserialization leading to Arbitrary File Deletion in my little forum

State: Published
Severity: 8.7 High
Published: Feb 9, 2026
Updated: Feb 11, 2026
Reserved: Feb 9, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-434 Unrestricted Upload of File with Dangerous Type
CWE-502 Deserialization of Untrusted Data

Affected Products

Product	Versions
mylittleforumMy-Little-Forum	< 20260208.1Affected

References

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