CVE-2026-39840

EUVD-2026-19929
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows XSS Targeting Non-Script Elements.This issue affects Mediawiki - Cargo Extension: before 3.8.7.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.1 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 9%
Affected Products (NVD)
VendorProductVersion
mediawikicargo
𝑥
< 3.8.7
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237966
https://phabricator.wikimedia.org/T416368