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

Quick assessment

Affected
Wikimedia Foundation Mediawiki - TemplateSandbox Extension
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在网页生成过程中对输入进行中立化处理不当（XSS 或“跨站脚本”）漏洞存在于 Wikimedia 基金会 MediaWiki 的 TemplateSandbox 扩展中，可导致跨站脚本攻击（XSS）。 受影响的 MediaWiki TemplateSandbox 扩展版本为：1.46.1 之前、1.45.5 之前或 1.43.10 之前的所有版本。

CVSS 4.8 · Medium EPSS 0.29% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
Wikimedia Foundation Mediawiki - TemplateSandbox Extension *< 1.46.1, 1.45.5, 1.43.10 affected
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I. Basic Information for CVE-2026-100376

Vulnerability Information
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Vulnerability Title
TemplateSandbox can be abused for XSS by asking another user to preview a page with a certain sandbox prefix
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Wikimedia Foundation Mediawiki - TemplateSandbox Extension * ~ 1.46.1, 1.45.5, 1.43.10 -

II. Public POCs for CVE-2026-100376

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III. Intelligence Information for CVE-2026-100376

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Vendor Advisories for CVE-2026-100376 (1)

Other References for CVE-2026-100376 (1)

Same Patch Batch · Wikimedia Foundation · 2026-09-25 · 8 CVEs total

CVE-2026-100382 10.0 CRITICAL Unauthenticated remote code execution through wikitext in ExternalData
CVE-2026-100377 6.9 MEDIUM Revision-deleted pages can be viewed through WikiLambda's action=edit and Special:ViewAbst
CVE-2026-100381 5.3 MEDIUM UploadWizard Flickr collection and set titles allow DOM XSS
CVE-2026-100380 5.3 MEDIUM Reflected XSS in Wikibase Special:SetLabel language validation
CVE-2026-100378 5.3 MEDIUM Missing permission check in the Translate sandbox doRemind action
CVE-2026-100379 5.3 MEDIUM Cross-request disclosure of CentralAuth cookies in Wikipedia Android App
CVE-2026-100383 4.8 MEDIUM Stored i18n XSS in WikiLambda's VisualEditor integration

IV. Related Vulnerabilities

Same product: Mediawiki - TemplateSandbox Extension
Same vendor: Wikimedia Foundation
Same weakness: CWE-79

V. Comments for CVE-2026-100376

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