Cross-Site Scripting Vulnerability in Wikimedia Foundation's Mediawiki TemplateSandbox Extension
CVE-2026-100376

4.8MEDIUM

Key Information:

Vendor

Wikimedia Foundation

Status
Mediawiki - Templatesandbox Extension
Vendor
CVE Published:
25 September 2026

What is CVE-2026-100376?

The Mediawiki TemplateSandbox Extension from Wikimedia Foundation contains a vulnerability that fails to properly neutralize user input during web page generation, leading to potential cross-site scripting (XSS) attacks. This flaw could allow attackers to inject malicious scripts into web pages viewed by other users, potentially compromising sensitive information and user sessions. The affected versions include those prior to 1.46.1, alongside specific versions 1.45.5 and 1.43.10.

Affected Version(s)

Mediawiki - TemplateSandbox Extension * < 1.46.1, 1.45.5, 1.43.10

References

https://phabricator.wikimedia.org/T430596
https://gerrit.wikimedia.org/r/q/I6630b9915f640bf75c85701...

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

cookmeplox
.