A mediawiki security update has been released for Debian GNU/Linux 10 to address an issue where some user-generated CSS selectors in MediaWiki were not escaped.

DSA 4651-1: mediawiki security update

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Debian Security Advisory DSA-4651-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
April 02, 2020   https://www.debian.org/security/faq
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Package : mediawiki
CVE ID : CVE-2020-10960

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

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/