Medium severity · published Sep 25, 2026
CVE-2026-100383
Stored i18n XSS in WikiLambda's VisualEditor integration
4.8
CVSS
0.3%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MW
Mediawiki - WikiLambda Extension · Wikimedia Foundation
1.47.0-alpha · source: vendor
Affected product
MW
Mediawiki - WikiLambda Extension
Wikimedia Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100383
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100383
gerrit.wikimedia.org
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikiLambda/+/1326391
phabricator.wikimedia.org
https://phabricator.wikimedia.org/T434967
More from Mediawiki - WikiLambda Extension
6.9
CVE-2026-100377
Revision-deleted pages can be viewed through WikiLambda's action=edit and Special:ViewAbstract