An issue was discovered in the ProofreadPage (aka Proofread Page) extension for MediaWiki through 1.39.3. In includes/Page/PageContentHandler.php and includes/Page/PageDisplayHandler.php, hidden users can be exposed via public interfaces.
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.
Link | Tags |
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https://phabricator.wikimedia.org/T326952 | patch exploit vendor advisory issue tracking |
https://gerrit.wikimedia.org/r/q/Ibe5f8e25dea155bbd811a65833394c0d4b906a34 | vendor advisory |