Medium severity · published Apr 7, 2026
CVE-2026-39936
Stored XSS in Score due to usage of non-reserved data attributes
6.9
CVSS
0.3%
EPSS
No
On KEV
Description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - Score Extension allows Cross-Site Scripting (XSS). The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MS
Mediawiki - Score Extension · The Wikimedia Foundation
before 1.43 · source: vendor
Affected product
MS
Mediawiki - Score Extension
The Wikimedia Foundation