Mediawiki · Visualeditor · CVE-2021-30153
**Name of the Vulnerable Software and Affected Versions**
MediaWiki versions 1.31 through 1.31.12
MediaWiki versions 1.32.x through 1.35.1
**Description**
An issue was discovered in the VisualEditor extension. When using VisualEditor to edit a MediaWiki user page belonging to an existing, but hidden, user, VisualEditor will disclose that the user exists. This is related to `ApiVisualEditor`.
**Recommendations**
For MediaWiki versions 1.31 through 1.31.12, update to version 1.31.13 or later.
For MediaWiki versions 1.32.x through 1.35.1, update to version 1.35.2 or later.
As a temporary workaround, consider restricting access to the `ApiVisualEditor` until a patch is available.