Vulnerability · Published Sep 25, 2026 · Assigned by wikimedia-foundation

CVE-2026-100376TemplateSandbox can be abused for XSS by asking another user to preview a page with a certain sandbox prefix

Medium 4.8

In plain English

A medium-severity cross-site scripting in Mediawiki - TemplateSandbox Extension from Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 4.0)4.8Medium

Exploit odds (30 days)0.3%top 77.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Wikimedia Foundation	Mediawiki - TemplateSandbox Extension	* – before 1.46.1, 1.45.5, 1.43.10

Weakness: CWE-79 · Vector: 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

In plain English

Official description

Affected products (as reported)

References