CVE-2020-26121

Description

An issue was discovered in the FileImporter extension for MediaWiki before 1.34.4. An attacker can import a file even when the target page is protected against "page creation" and the attacker should not be able to create it. This occurs because of a mishandled distinction between an upload restriction and a create restriction. An attacker cannot leverage this to overwrite anything, but can leverage this to force a wiki to have a page with a disallowed title.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.16%
Vendor Advisory fedoraproject.org Vendor Advisory wikimedia.org Vendor Advisory wikimedia.org Vendor Advisory wikimedia.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://commons.wikimedia.org/w/index.php?oldid=454609892#File:Wiki.png vendor advisory
https://phabricator.wikimedia.org/T262628 issue tracking patch vendor advisory
https://gerrit.wikimedia.org/r/q/Ib852a96afc4dca10516d0510e69c10f9892b351b patch vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-26121?
CVE-2020-26121 has been scored as a high severity vulnerability.
How to fix CVE-2020-26121?
To fix CVE-2020-26121, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-26121 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-26121 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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