CVE-2026-39935

XSS-via-i18n in localised wiki names

MEDIUM

6.9

CVSS Score

Published: April 7, 2026 at 10:04 PM UTC

Updated: July 21, 2026 at 07:26 PM UTC

1 product affected across 1 vendorCampaignEvents

Using Mediawiki - CampaignEvents Extension by The Wikimedia Foundation?

Get instant alerts when new vulnerabilities affect Mediawiki - CampaignEvents Extension - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM6.9

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

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 affects Mediawiki - CampaignEvents Extension: 1.43.7, 1.44.4, 1.45.2.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

CampaignEvents · Wikimediamediawiki

60%

v < 1.431.43 1.44 1.45

Affected range stops below 1.43, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: cverecord

https://phabricator.wikimedia.org/T418254

Source: cverecord

https://gerrit.wikimedia.org/r/c/1249320

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMwikimedia-foundation

Vector?

Quick Info

StatusAWAITING ANALYSIS

CWE

CWE-79

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card