CVE-2026-39838
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows XSS Targeting Non-Script Elements. The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.
Published:Apr 7, 2026
Last Modified:Apr 9, 2026
EPS:Apr 7, 2026
EPSS Score:0.00047
CVSS Score:6.9
Affected Products
Vendor
Product
Action
Vendor
Wikimedia
Product
Mediawiki-proofreadpage Extension
Wikimedia
Mediawiki-proofreadpage Extension
Exploits
No exploit reference
Common Weakness Enumeration
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
