A mediawiki security update has been released for Debian GNU/Linux 9 LTS to address multiple security issues.

DLA 2379-1: mediawiki security update

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Debian LTS Advisory DLA-2379-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Roberto C. Sánchez
September 25, 2020   https://wiki.debian.org/LTS
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Package : mediawiki
Version : 1:1.27.7-1~deb9u4
CVE ID : CVE-2020-25813 CVE-2020-25814 CVE-2020-25827 CVE-2020-25828

Multiple security issues were discovered in MediaWiki, a website engine
for collaborative work: SpecialUserRights could leak whether a user
existed or not, multiple code paths lacked HTML sanitisation allowing
for cross-site scripting and TOTP validation applied insufficient rate
limiting against brute force attempts.

For Debian 9 stretch, these problems have been fixed in version
1:1.27.7-1~deb9u4.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS