A mediawiki security update has been released for Debian GNU/Linux 9 and 10. It was discovered that the Title blacklist functionality in MediaWiki, a website engine for collaborative work, could by bypassed.

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Debian Security Advisory DSA-4592-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
December 26, 2019   https://www.debian.org/security/faq
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Package : mediawiki
CVE ID : CVE-2019-19709

It was discovered that the Title blacklist functionality in MediaWiki,
a website engine for collaborative work, could by bypassed.

For the oldstable distribution (stretch), this problem has been fixed
in version 1:1.27.7-1~deb9u3.

For the stable distribution (buster), this problem has been fixed in
version 1:1.31.6-1~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/