CVE-2026-39839

Stored XSS through URLs in Cargo's map format

Published Apr 7, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Description
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Mediawiki
Mediawiki cargo
CPEs cpe:2.3:a:mediawiki:cargo:*:*:*:*:*:*:*:*
Vendors & Products Mediawiki
Mediawiki cargo
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

Type Values Removed Values Added
First Time appeared Wikimedia
Wikimedia mediawiki-cargo Extension
Vendors & Products Wikimedia
Wikimedia mediawiki-cargo Extension
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.
Title Stored XSS through URLs in Cargo's map format
Weaknesses CWE-80
References
Metrics cvssV4_0

{'score': 6.3, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
wikimedia-foundation
Published
Updated
Apr 7, 2026, 8:42 PM
Reserved
Apr 7, 2026, 6:21 PM
Status
Analyzed
Published
Apr 7, 2026, 8:16 PM
Modified
Jul 24, 2026, 9:10 PM