CVE-2026-39935 MEDIUM

CVE-2026-39935: XSS-via-i18n in localised wiki names

Vendor The Wikimedia Foundation
Product Mediawiki - CampaignEvents Extension
Weakness CWE-79 · XSS
Published April 7, 2026
Last update April 8, 2026
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - CampaignEvents Extension allows Cross-Site Scripting (XSS). This issue was remediated only on the `master` branch.

Key dates

02Disclosure timeline

April 7, 2026 CVE published
April 8, 2026 Record updated