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CVE-2026-39840— CSS injection in multiple Cargo display formats

Quick assessment

Affected
Wikimedia Foundation Mediawiki - Cargo 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 - Cargo Extension是MediaWiki开源的一个查询和存储数据的插件。 MediaWiki - Cargo Extension 3.8.7之前版本存在安全漏洞，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 0.24% · P14
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I. Basic Information for CVE-2026-39840

Vulnerability Information
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Vulnerability Title
CSS injection in multiple Cargo display formats
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows XSS Targeting Non-Script Elements.This issue affects Mediawiki - Cargo Extension: before 3.8.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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 - Cargo Extension 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MediaWiki - Cargo Extension是MediaWiki开源的一个查询和存储数据的插件。 MediaWiki - Cargo Extension 3.8.7之前版本存在安全漏洞，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 - Cargo Extension 0 ~ 3.8.7 -

II. Public POCs for CVE-2026-39840

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III. Intelligence Information for CVE-2026-39840

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Patches & Fixes for CVE-2026-39840 (1)

Vendor Advisories for CVE-2026-39840 (1)

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-2026-39838 ProofreadPage improperly sanitizes multiline styles using Sanitizer::checkCSS
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 - Cargo Extension
Same vendor: Wikimedia Foundation
Same weakness: CWE-79

V. Comments for CVE-2026-39840

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