A mediawiki security update has been released for Debian GNU/Linux 10 and 11 to address multiple security issues.

DSA 4979-1: mediawiki security update

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Debian Security Advisory DSA-4979-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
October 01, 2021   https://www.debian.org/security/faq
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Package : mediawiki
CVE ID : CVE-2021-35197 CVE-2021-41798 CVE-2021-41799 CVE-2021-41800
CVE-2021-41801

Multiple security issues were found in MediaWiki, a website engine for
collaborative work, which could result in cross-site scripting,
denial of service and a bypass of restrictions in the "Replace Text"
extension.

For the oldstable distribution (buster), these problems have been fixed
in version 1:1.31.16-1~deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 1:1.35.4-1~deb11u1.

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/