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

CVSS 4.0 4.8 MEDIUMCheck source for fixed versionsKEV status unknown

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-100376

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-100376

Published

Mediawiki - TemplateSandbox Extension

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Wikimedia Foundation",
                    "product": "Mediawiki - TemplateSandbox Extension",
                    "repo": "https://gerrit.wikimedia.org/g/mediawiki/extensions/TemplateSandbox/+/refs/heads/master",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "*",
                            "lessThan": "1.46.1, 1.45.5, 1.43.10",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

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Sources read 12 Nov 16:29 UTC · 265 of 275 readable · 263 fully read · documentation 469/469 current