CVE-2026-100376CWE-79cross-site-scripting

CVE-2026-100376

published September 26, 2026

CVSS
4.8
EPSS
0%
Percentile
21.0
In the wild
Unconfirmed
What it is

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - TemplateSandbox Extension allows Cross-Site Scripting (XSS).

This issue affects Mediawiki - TemplateSandbox Extension: from * before 1.46.1, 1.45.5, 1.43.10.

The record
Technical detail
CVSS
4.8 · NONE
CVSS v4.0
4.8 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
EPSS
0.00295 · 21.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-26T01:17Z
References (2)
https://gerrit.wikimedia.org/r/q/I6630b9915f640bf75c8570165eb8728bd7a2c07a · c4f26cc8-17ff-4c99-b5e2-38fc1793eacchttps://phabricator.wikimedia.org/T430596 · c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
EPSS history
Timeline
  • 27 SEP 03:24Z
    EPSS moved — → 0%
    epss
  • 25 SEP 20:48Z
    TemplateSandbox can be abused for XSS by asking another user to preview a page with a certain sandbox prefix
    cvelistv5