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Wikimedia Foundation MediaWiki TemplateSandbox ExtensionTemplateSandbox does not check read permissions for the page being previewed

Risk 66
Severity
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Missing Authorization vulnerability in Wikimedia Foundation Mediawiki - TemplateSandbox Extension allows Accessing Functionality Not Properly Constrained by ACLs.

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

First published (updated )
CVE-2026-100240

Wikimedia Foundation MediaWiki TemplateSandbox ExtensionTemplateSandbox can be abused for XSS by asking another user to preview a page with a certain sandbox prefix

Risk 41
Severity
4.8
XSS
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

First published (updated )
CVE-2026-100376

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