Vulnerability identifier: #VU47353

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-25869

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MediaWiki
Web applications / CMS

Vendor: MediaWiki.org

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to handling of actor ID does not necessarily use the correct database or correct wiki. A remote attacker can gain unauthorized access to sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MediaWiki: 1.31.0 - 1.31.9, 1.32.0 - 1.32.6, 1.34.0 - 1.34.3

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External links
http://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html
http://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html
http://phabricator.wikimedia.org/T260485

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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.