A mediawiki security update has been released for Debian GNU/Linux 10 to address multiple security issues.

DSA 4889-1: mediawiki security update

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Debian Security Advisory DSA-4889-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
April 10, 2021   https://www.debian.org/security/faq
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Package : mediawiki
CVE ID : CVE-2021-20270 CVE-2021-27291 CVE-2021-30152 CVE-2021-30159
CVE-2021-30154 CVE-2021-30155 CVE-2021-30157 CVE-2021-30158

Multiple security issues were found in MediaWiki, a website engine for
collaborative work, which could result in incomplete page/blocking
protection, denial of service or cross-site scripting.

For the stable distribution (buster), these problems have been fixed in
version 1:1.31.14-1~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/