CVE-2026-39839 - Vulnerability Details - OpenCVE

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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact High

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact partial

No data.

No data.

No data.

References

Link	Providers
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237957
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237977
https://phabricator.wikimedia.org/T416271

History

Tue, 07 Apr 2026 21:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Tue, 07 Apr 2026 20:45:00 +0000

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		https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237957 https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237977 https://phabricator.wikimedia.org/T416271
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'}`

MITRE

Status: PUBLISHED

Assigner: wikimedia-foundation

Published: 2026-04-07T19:29:11.025Z

Updated: 2026-04-07T20:42:43.130Z

Reserved: 2026-04-07T18:21:12.573Z

Link: CVE-2026-39839

Vulnrichment

Updated: 2026-04-07T20:39:58.956Z

NVD

Status : Received

Published: 2026-04-07T20:16:33.773

Modified: 2026-04-07T20:16:33.773

Link: CVE-2026-39839

Redhat

No data.

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