In MediaWiki before 1.31.8, 1.32.x and 1.33.x before 1.33.4, and 1.34.x before 1.34.2, private wikis behind a caching server using the img_auth.php image authorization security feature may have had their files cached publicly, so any unauthorized user could view them. This occurs because Cache-Control and Vary headers were mishandled.
| Software | From | Fixed in |
|---|---|---|
| mediawiki / mediawiki | - | 1.31.8 |
| mediawiki / mediawiki | 1.32.0 | 1.33.4 |
| mediawiki / mediawiki | 1.34 | 1.34.2 |
| fedoraproject / fedora | 32 | 32.x |
| debian / debian_linux | 9.0 | 9.0.x |
| debian / debian_linux | 10.0 | 10.0.x |