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Debian LTS Advisory DLA-2648-2                [email protected]
https://www.debian.org/lts/security/                          Abhijith PA
May 07, 2021                                  https://wiki.debian.org/LTS
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Package        : mediawiki
Version        : 1:1.27.7-1~deb9u9
CVE ID         : CVE-2021-20270 CVE-2021-27291 CVE-2021-30152 
                 CVE-2021-30155 CVE-2021-30158 CVE-2021-30159
Debian Bug     : 985574 984664 

The patch from latest upstream release to address CVE-2021-30152 was 
not portable to stretch-security version causing MediaWiki APIs to 
fail. This update includes a patch from upstream REL_31 release which 
fix the issue.  

For Debian 9 stretch, this problem has been fixed in version
1:1.27.7-1~deb9u9.

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