CVE-2026-39839 PUBLISHED

Stored XSS through URLs in Cargo's map format

Assigner: wikimedia-foundation
Reserved: 07.04.2026 Published: 07.04.2026 Updated: 07.04.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 6.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	High
Attack Complexity	Low	Integrity	None	Integrity	High
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	Wikimedia Foundation
Product	Mediawiki - Cargo Extension
Versions	Default: unaffected affected from 0 to 3.8.7 (excl.)

Credits

SomeRandomDeveloper finder
Yaron Koren remediation developer

References

Problem Types

CWE-80 Improper neutralization of Script-Related HTML tags in a web page (basic XSS) CWE

Impacts

CAPEC-592 Stored XSS