Vulnerability · Published Sep 29, 2026 · Assigned by wikimedia-foundation
CVE-2026-100238Flow colon-separator and flow-guidedtour-optin-welcome-description messages allow stored XSS
Medium 6.1
In plain English
A medium-severity cross-site scripting in Mediawiki - Flow Extension from Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 91.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wikimedia Foundation | Mediawiki - Flow Extension | * – before 1.46.1, 1.45.5, 1.43.10 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N