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PHP CVE-2026-25923

CRITICAL
Unrestricted Upload of File with Dangerous Type (CWE-434)
2026-02-09 security-advisories@github.com
PHP Deserialization File Upload My Little Forum
9.1
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Feb 09, 2026 - 22:16 nvd
CRITICAL 9.1

DescriptionNVD

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.

AnalysisAI

my little forum PHP forum software has an unrestricted file upload allowing authenticated users to upload dangerous file types.

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RemediationAI

Within 24 hours: Identify all affected systems running classical threaded view. and apply vendor patches immediately. …

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CVE-2026-25923 vulnerability details – vuln.today
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