---
id: CVE-2026-100238
title: >-
  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…
summary: >-
  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…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: Wikimedia Foundation
product: Mediawiki - Flow Extension
affected:
  - 'mediawiki_-_flow_extension < 1.46.1, 1.45.5, 1.43.10'
published: '2026-09-29'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T21:16:52.980'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100238'
references:
  - url: 'https://gerrit.wikimedia.org/r/q/Ic6149363fe1de2440240fe88aebfd4ae30cea606'
    label: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
  - url: 'https://phabricator.wikimedia.org/T432425'
    label: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T18:40:56.402418Z'
epss: 0.00188
epssPercentile: 0.08356
ingestedAt: '2026-09-29T16:39:33.275Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.