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  4. CVE 2026 100238 flow colon separator and flow guidedtour optin
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Back to active CVEs
Medium · CVSS 6.1CVE-2026-100238

Flow colon-separator and flow-guidedtour-optin-welcome-description messages allow stored XSSCVE-2026-100238

Answer in brief

CVE-2026-100238 records a Medium severity (CVSS 6.1) vulnerability in Flow colon-separator and flow-guidedtour-optin-welcome-description messages allow stored XSS. The current sources do not mark it as known exploited. The current feed maps Wikimedia Foundation/Mediawiki - Flow Extension (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 29, 2026Updated Sep 30, 2026Source checked Nov 13, 2026First seen by HOL Sep 29, 2026Material review Sep 30, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Wikimedia Foundation/Mediawiki - Flow Extension (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Wikimedia Foundation/Mediawiki - Flow Extensiongeneric>=* <1.46.1 1.45.5 1.43.101.46.1, 1.45.5, 1.43.10, 1.46.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Wikimedia Foundation/Mediawiki - Flow Extension.
  2. 2Review the reported fix. Update Wikimedia Foundation/Mediawiki - Flow Extension to 1.46.1, 1.45.5, 1.43.10 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 29, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 29, 2026

Sources and claim methodology

  • Source referencegerrit.wikimedia.org
  • Source referencephabricator.wikimedia.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • IBM ContextForge MCP Gateway is affected by a DOM-based cross-site scriptingAlso CWE-79
  • SvelteKit: Protocol-relative module import during server-side route resolution allows cross-origin script executionAlso CWE-79
  • SvelteKit: Prerendered redirect paths can inject arbitrary rules into the `_redirects` file generated by `@sveltejs/adapter-cloudflare`Also CWE-79
  • IBM Cyber Fraud includes components with multiple known vulnerabilitiesAlso CWE-79

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Nov 13, 2026
References
2 linked sources
Open source record