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CVE-2026-39837— Stored XSS through the dynamic table format in Cargo

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，该漏洞源于对脚本相关HTML标签中和不当，可能导致存储型跨站脚本攻击。

AI Predicted 5.4 Difficulty: Easy EPSS 0.24% · P14
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I. Basic Information for CVE-2026-39837

Vulnerability Information
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Vulnerability Title
Stored XSS through the dynamic table format in Cargo
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in WikiWorks Mediawiki - Cargo Extension allows Stored XSS.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:H/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
Web页面中脚本相关HTML标签转义处理不恰当(基本跨站脚本)
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，该漏洞源于对脚本相关HTML标签中和不当，可能导致存储型跨站脚本攻击。
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-2026-39837

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III. Intelligence Information for CVE-2026-39837

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Vendor Advisories for CVE-2026-39837 (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-2026-39840 CSS injection in multiple Cargo display formats
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-80

V. Comments for CVE-2026-39837

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