CVE-2026-25923Public exploitNetwork attack vector

Arbitrary file deletion via Phar image deserialization

Published Feb 9, 2026 · Updated Feb 9, 2026

Phar deserialization in mylittleforum before 20260208.1 allows remote attackers to delete arbitrary server files through image uploads. The do_bbcode_img function passes an accepted phar:// image URL to getimagesize, which deserializes attacker-controlled Phar metadata and reaches Smarty 4.1.0's unlink-based POP chain. Exploitation requires PHP before 8.0, BBCode, and image uploads; upload privileges range from registered users to anonymous visitors by configuration.

CVSS severity8.7
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Phar deserialization in mylittleforum before 20260208.1 allows remote attackers to delete arbitrary server files through image uploads. The do_bbcode_img function passes an accepted phar:// image URL to getimagesize, which deserializes attacker-controlled Phar metadata and reaches Smarty 4.1.0's unlink-based POP chain. Exploitation requires PHP before 8.0, BBCode, and image uploads; upload privileges range from registered users to anonymous visitors by configuration.

The record

CVE
CVE-2026-25923
Published
Feb 9, 2026
Updated
Feb 9, 2026
Vendor
My Little Forum
Product
my little forum
Classifications
CWE-502, CWE-434, T1485, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 20260208.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

My Little Forum · my little forumversion=< 20260208.1

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
8.7GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CWE-434Unrestricted Upload of File with Dangerous Type
T1485Data Destruction
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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