CVE-2026-103339
Received Received - Intake

Stored XSS in Metform WordPress Plugin

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: Patchstack

Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Wpmet Metform metform allows Stored XSS.This issue affects Metform: from n/a through 4.3.0.

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Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-01
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-103339
EUVD
EUVD-2026-90804

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
wpmet metform to 4.3.0 (inc)
wpmet metform From 4.0.0 (inc) to 4.3.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

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Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Wpmet Metform plugin. It allows attackers to inject malicious scripts into web pages generated by the plugin. The flaw exists due to improper neutralization of user input during web page generation.

Detection Guidance

To detect this vulnerability, check the installed version of the Metform plugin. If it is 4.3.0 or below, the system is vulnerable. Use commands like 'wp plugin list' in WordPress or inspect the plugin directory for version details.

Impact Analysis

Attackers could exploit this to steal visitor data, hijack user accounts, or perform unauthorized actions on behalf of users. Exploitation requires user interaction, such as clicking a malicious link or submitting a form, and typically involves a privileged user like a Contributor or Developer.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by enabling attackers to inject malicious scripts that steal visitor data or hijack accounts. Stored XSS may lead to unauthorized access to sensitive information, violating data protection requirements under these regulations.

Mitigation Strategies

Immediately update the Metform plugin to version 4.3.1 or later. Enable auto-updates for vulnerable plugins if using Patchstack. Remove or restrict access for untrusted users who could exploit this via user interaction.

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