Vulnerability identifier: #VU47351

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-26121

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MediaWiki
Web applications / CMS

Vendor: MediaWiki.org

Description

The vulnerability allows a remote attacker to compromise the system.

The vulnerability exists due to a mishandled distinction between an upload restriction and a create restriction in the FileImporter extension. A remote attacker can force a wiki to have a page with a disallowed title.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MediaWiki: 1.34 - 1.34.3

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External links
http://commons.wikimedia.org/w/index.php?oldid=454609892#File:Wiki.png
http://gerrit.wikimedia.org/r/q/Ib852a96afc4dca10516d0510e69c10f9892b351b
http://phabricator.wikimedia.org/T262628

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.