---
id: CVE-2026-100380
title: >-
  Improper Neutralization of Input During Web Page Generation (XSS or
  'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki -
  Wikibase Extension allows Cross-Site Scripting (XSS).


  This issue affects Mediawiki - Wikibase …
summary: >-
  Improper Neutralization of Input During Web Page Generation (XSS or
  'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki -
  Wikibase Extension allows Cross-Site Scripting (XSS).


  This issue affects Mediawiki - Wikibase …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N'
cwe:
  - CWE-79
vendor: Wikimedia Foundation
product: Mediawiki - Wikibase Extension
affected:
  - 'mediawiki_-_wikibase_extension < 1.46.1, 1.45.5, 1.43.10'
published: '2026-09-25'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T23:16:32.093'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100380'
references:
  - url: 'https://gerrit.wikimedia.org/r/q/I7407f9748d72161ce25ad0ba2446869bb1776857'
    label: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
  - url: 'https://phabricator.wikimedia.org/T434549'
    label: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-26T22:43:05.441903Z'
cvssSource: cna
epss: 0.0033
epssPercentile: 0.23567
ingestedAt: '2026-09-25T21:19:40.141Z'
---

## Overview

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Wikibase Extension allows Cross-Site Scripting (XSS).

This issue affects Mediawiki - Wikibase 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.