CVE-2026-25923

CRITICAL

9.1

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.

CVE Details

CVSS v3.1 Score9.1

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/9/2026

Last Modified3/17/2026

Sourcenvd

Honeypot Sightings0

Affected Products

mylittleforum:my_little_forum

Weaknesses (CWE)

CWE-434CWE-502

References

https://github.com/My-Little-Forum/mylittleforum/releases/tag/20260208.1(security-advisories@github.com)

https://github.com/My-Little-Forum/mylittleforum/security/advisories/GHSA-wr9p-3c3g-78fw(security-advisories@github.com)

IOC Correlations

No correlations recorded

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