CVE-2026-39933 PUBLISHED

Multiple XSS vulnerabilities in GlobalWatchlist

Assigner: wikimedia-foundation
Reserved: 07.04.2026 Published: 07.04.2026 Updated: 08.04.2026

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - GlobalWatchlist Extension allows Cross-Site Scripting (XSS).This issue affects non release branches.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CVSS Score: 10

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

CVSS 4.0

Product Status

Vendor	The Wikimedia Foundation
Product	Mediawiki - GlobalWatchlist Extension
Versions	Default: unaffected Version 1.43.7 is unaffected Version 1.44.4 is unaffected Version 1.45.2 is unaffected

Credits

SomeRandomDeveloper finder

References

Problem Types

CWE-79 Improper neutralization of input during web page generation ('cross-site scripting') CWE

Impacts

CAPEC-63 Cross-Site Scripting (XSS)