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CVE-2026-39838— ProofreadPage improperly sanitizes multiline styles using Sanitizer::checkCSS

Quick assessment

Affected
Wikimedia Foundation MediaWiki - ProofreadPage 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 - ProofreadPage Extension是MediaWiki开源的一个文档对照插件。 MediaWiki - ProofreadPage Extension存在安全漏洞，该漏洞源于网页生成期间输入中和不当，可能导致针对非脚本元素的跨站脚本攻击。

AI Predicted 5.4 Difficulty: Easy EPSS 0.45% · P38
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I. Basic Information for CVE-2026-39838

Vulnerability Information
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Vulnerability Title
ProofreadPage improperly sanitizes multiline styles using Sanitizer::checkCSS
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows XSS Targeting Non-Script Elements. 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:N/SC:L/SI:N/SA:N
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 - ProofreadPage Extension 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MediaWiki - ProofreadPage Extension是MediaWiki开源的一个文档对照插件。 MediaWiki - ProofreadPage Extension存在安全漏洞，该漏洞源于网页生成期间输入中和不当，可能导致针对非脚本元素的跨站脚本攻击。
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
Wikimedia Foundation MediaWiki - ProofreadPage Extension - -

II. Public POCs for CVE-2026-39838

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III. Intelligence Information for CVE-2026-39838

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Same Patch Batch · Wikimedia Foundation · 2026-04-07 · 6 CVEs total

CVE-2026-39841 Stored XSS through list fields on Cargo's page values and Special:CargoTables
CVE-2026-39840 CSS injection in multiple Cargo display formats
CVE-2026-39837 Stored XSS through the dynamic table format in Cargo
CVE-2026-39839 Stored XSS through URLs in Cargo's map format
CVE-2026-5762 ReportIncident DiscussionTools integration causes slow requests

IV. Related Vulnerabilities

Same product: MediaWiki - ProofreadPage Extension
Same vendor: Wikimedia Foundation
Same weakness: CWE-79

V. Comments for CVE-2026-39838

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