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CVE-2026-100238— Flow colon-separator and flow-guidedtour-optin-welcome-description messages allow stored XSS

Quick assessment

Affected
Wikimedia Foundation Mediawiki - Flow 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.

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Flow Extension allows Stored XSS. This issue affects Mediawiki - Flow Extension: from * before 1.46.1, 1.45.5, 1.43.10

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I. Basic Information for CVE-2026-100238

Vulnerability Information

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Vulnerability Title
Flow colon-separator and flow-guidedtour-optin-welcome-description messages allow stored XSS
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 - Flow Extension allows Stored XSS. This issue affects Mediawiki - Flow Extension: from * before 1.46.1, 1.45.5, 1.43.10.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 - Flow Extension * ~ 1.46.1, 1.45.5, 1.43.10 -

II. Public POCs for CVE-2026-100238

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III. Intelligence Information for CVE-2026-100238

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Other References for CVE-2026-100238 (2)

Same Patch Batch · Wikimedia Foundation · 2026-09-29 · 8 CVEs total

CVE-2026-100240 TemplateSandbox does not check read permissions for the page being previewed
CVE-2026-100241 Private change tags exposed to anonymous users via revision-tags-change events
CVE-2026-102796 Unauthenticated SQL injection in UserPageViewTracker via filterusers and ignoreusers param
CVE-2026-100244 CentralAuth exposes locally suppressed block information via globaluserinfo API and Specia
CVE-2026-100245 Stored XSS on Wikibase Special:SetSiteLink via unescaped system message
CVE-2026-100242 DataTransfer depends on phpspreadsheet version vulnerable to CVE-2026-59933 (XLS/OLE memor
CVE-2026-100243 Stored XSS in WikiSEO author and image properties on action=info

IV. Related Vulnerabilities

Same vendor: Wikimedia Foundation
Same weakness: CWE-79

V. Comments for CVE-2026-100238

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