All vulnerabilities
CVE-2026-100238

Flow colon-separator and flow-guidedtour-optin-welcome-description messages allow stored XSS

Wikimedia Foundation Mediawiki - Flow ExtensionApplications & CMS
Open in ThreatlineRecord JSON
CVSS
6.1Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.19%Chance of exploitation activity in the next 30 days, higher than 8% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.46.1, 1.45.5, 1.43.10Fixed versionCVE List
Published29 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

  • 1.46.1, 1.45.5, 1.43.10Mediawiki - Flow ExtensionCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 1

  • Mediawiki - Flow Extensionaffected: * before 1.46.1, 1.45.5, 1.43.10CVE List

References 2