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CVE-2026-100383— Stored i18n XSS in WikiLambda's VisualEditor integration

Quick assessment

Affected
Wikimedia Foundation Mediawiki - WikiLambda 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.

网页生成过程中输入中和不当（XSS 或“跨站脚本”）漏洞。Wikimedia Foundation MediaWiki - WikiLambda 扩展存在跨站脚本（XSS）漏洞。 受影响的产品为 MediaWiki - WikiLambda 扩展 1.47.0-alpha 版本。该问题已在 分支中得到修复。

CVSS 4.8 · Medium EPSS 0.32% · P22

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Wikimedia Foundation Mediawiki - WikiLambda Extension 1.47.0-alpha affected
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I. Basic Information for CVE-2026-100383

Vulnerability Information
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Vulnerability Title
Stored i18n XSS in WikiLambda's VisualEditor integration
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 - WikiLambda Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - WikiLambda Extension: 1.47.0-alpha. The issue has been remediated on the `master` branch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
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 - WikiLambda Extension 1.47.0-alpha -

II. Public POCs for CVE-2026-100383

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III. Intelligence Information for CVE-2026-100383

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Vendor Advisories for CVE-2026-100383 (1)

Other References for CVE-2026-100383 (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-2026-100376 4.8 MEDIUM TemplateSandbox can be abused for XSS by asking another user to preview a page with a cert

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-100383

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