CVE-2026-100238
Received Received - Intake

Stored XSS in MediaWiki Flow Extension

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: wikimedia-foundation

Description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Flow Extension allows Stored XSS. This issue affects Mediawiki - Flow Extension: from * before 1.46.1, 1.45.5, 1.43.10.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100238
EUVD
EUVD-2026-89033

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
wikimedia_foundation mediawiki_flow_extension From 1.43.10 (inc) to 1.46.1 (exc)
wikimedia_foundation mediawiki_flow_extension 1.45.5
wikimedia_foundation mediawiki_flow_extension 1.43.10
wikimedia mediawiki_flow_extension to 1.46.1 (exc)
wikimedia mediawiki_flow_extension 1.45.5
wikimedia mediawiki_flow_extension 1.43.10

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 Wikimedia Foundation MediaWiki Flow Extension. It allows attackers to inject malicious scripts into web pages that are then stored on the server and served to other users. The issue affects versions before 1.46.1, 1.45.5, and 1.43.10.

Impact Analysis

If you use a vulnerable version of the MediaWiki Flow Extension, attackers could exploit this to steal user sessions, deface pages, or deliver malware. Users visiting affected pages may have their data compromised or be redirected to malicious sites.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR and HIPAA requirements for data protection. Organizations may face fines or legal consequences if user data is compromised due to this flaw.

Mitigation Strategies

Update MediaWiki Flow Extension to version 1.46.1, 1.45.5, or 1.43.10 or later to address the XSS vulnerability.

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