Debian Security Advisory

DLA-2504-1 mediawiki -- LTS security update

Date Reported:
22 Dec 2020
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2020-15005, CVE-2020-35477, CVE-2020-35479, CVE-2020-35480.
More information:

Multiple security issues were discovered in MediaWiki, a website engine for collaborative work.

  • CVE-2020-15005

    Private wikis behind a caching server using the img_auth.php image authorization security feature may have had their files cached publicly, so any unauthorized user could view them.

  • CVE-2020-35477

    Blocks legitimate attempts to hide log entries in some situations.

  • CVE-2020-35479

    Allows XSS via BlockLogFormatter.php. Language::translateBlockExpiry itself does not escape in all code paths. For example, the return of Language::userTimeAndDate is is always unsafe for HTML in a month value.

  • CVE-2020-35480

    Missing users (accounts that don't exist) and hidden users (accounts that have been explicitly hidden due to being abusive, or similar) that the viewer cannot see are handled differently, exposing sensitive information about the hidden status to unprivileged viewers.

For Debian 9 stretch, these problems have been fixed in version 1:1.27.7-1~deb9u7.

We recommend that you upgrade your mediawiki packages.

For the detailed security status of mediawiki please refer to its security tracker page at:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: