CVE-2026-39935CWE-79

XSS-via-i18n in localised wiki names

Medium · published April 7, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
38.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
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
EPSS
0.00453 · 38.4th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-04-07T22:04Z
EPSS history
Timeline
  • 07 APR 22:04Z
    XSS-via-i18n in localised wiki names
    cvelistv5