It was discovered that some user-generated CSS selectors in MediaWiki, a website engine for collaborative work, were not escaped.

The oldstable distribution (stretch) is not affected.

For the stable distribution (buster), this problem has been fixed in version 1:1.31.7-1~deb10u1.

We recommend that you upgrade your mediawiki packages.

For the detailed security status of mediawiki please refer to its security tracker page at: \ https://security-tracker.debian.org/tracker/mediawiki