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CVE-2026-25923— Phar Deserialization leading to Arbitrary File Deletion in my little forum

Quick assessment

Affected
My-Little-Forum mylittleforum
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

my little forum是My Little Forum开源的一套基于PHP和MySQL的在线论坛系统。 my little forum 20260208.1之前版本存在代码问题漏洞，该漏洞源于URL验证未过滤phar协议，可能导致任意文件删除。

AI Predicted 9.8 Difficulty: Moderate EPSS 0.43% · P36
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I. Basic Information for CVE-2026-25923

Vulnerability Information
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Vulnerability Title
Phar Deserialization leading to Arbitrary File Deletion in my little forum
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
my little forum 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
my little forum是My Little Forum开源的一套基于PHP和MySQL的在线论坛系统。 my little forum 20260208.1之前版本存在代码问题漏洞，该漏洞源于URL验证未过滤phar协议，可能导致任意文件删除。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
My-Little-Forum mylittleforum < 20260208.1 -

II. Public POCs for CVE-2026-25923

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III. Intelligence Information for CVE-2026-25923

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Vendor Advisories for CVE-2026-25923 (1)

IV. Related Vulnerabilities

Same product: mylittleforum
Same vendor: My-Little-Forum
Same weakness: CWE-434

V. Comments for CVE-2026-25923

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