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    CVE-2026-39840

    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.

    Published:Apr 7, 2026
    Last Modified:Apr 15, 2026
    EPS:Apr 7, 2026
    EPSS Score:0.00052
    CVSS Score:6.1

    Affected Products

    Vendor
    Mediawiki
    Product
    Cargo
    Vendor
    Wikimedia
    Product
    Mediawiki-cargo Extension

    Exploits

    https://phabricator.wikimedia.org/T416368

    Related CVEs

    CVE-2026-39837 (CVSS 6.3) — Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in WikiWorks Media…
    CVE-2026-39841 (CVSS 6.3) — Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Wikimedia Found…
    CVE-2026-39839 (CVSS 6.3) — Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Wikimedia Found…
    CVE-2024-47847 (CVSS 6.9) — Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in T…
    CVE-2024-47846 (CVSS 6.9) — Cross-Site Request Forgery (CSRF) vulnerability in The Wikimedia Foundation Mediawiki - Cargo allows Cross Sit…
    CVE-2024-47849 (CVSS 8.8) — Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in The Wiki…
    CVE-2023-29134 (CVSS 8.6) — An issue was discovered in the Cargo extension for MediaWiki through 1.39.3. There is mishandling of backticks…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High