CVE-2026-39933— Multiple XSS vulnerabilities in GlobalWatchlist
Quick assessment
Affected
The Wikimedia Foundation Mediawiki - GlobalWatchlist Extension
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.
MediaWiki GlobalWatchlist Extension是MediaWiki开源的一个全局监视列表扩展组件。 MediaWiki GlobalWatchlist Extension存在安全漏洞，该漏洞源于网页生成期间输入中和不当，可能导致跨站脚本攻击。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-39933
Vulnerability Information
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Vulnerability Title
Multiple XSS vulnerabilities in GlobalWatchlist
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - GlobalWatchlist Extension allows Cross-Site Scripting (XSS). The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
MediaWiki GlobalWatchlist Extension 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MediaWiki GlobalWatchlist Extension是MediaWiki开源的一个全局监视列表扩展组件。 MediaWiki GlobalWatchlist Extension存在安全漏洞，该漏洞源于网页生成期间输入中和不当，可能导致跨站脚本攻击。
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 |
|---|---|---|---|---|
| The Wikimedia Foundation | Mediawiki - GlobalWatchlist Extension | - | - |
|
II. Public POCs for CVE-2026-39933
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · The Wikimedia Foundation · 2026-04-07 · 6 CVEs total
| CVE-2026-22711 | Stored XSS through system messages in WikiLove | |
| CVE-2026-39937 | Global vanishing does not completely remove user email | |
| CVE-2026-39934 | Growth Experiments ReassignMenteesJob runs as an infinite loop | |
| CVE-2026-39936 | Stored XSS in Score due to usage of non-reserved data attributes | |
| CVE-2026-39935 | XSS-via-i18n in localised wiki names |
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V. Comments for CVE-2026-39933
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