Auth bypass in MediaWiki
CVE-2021-44857
An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=mcrundo followed by action=mcrrestore to replace the content of any arbitrary page (that the user doesn't have edit rights for). This applies to any public wiki, or a private wiki that has at least one page set in $wgWhitelistRead.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.009 (57.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
Weakness classification (CWE)
References
- phabricator.wikimedia.org/T297322 (Third Party Advisory)
- www.mediawiki.org/wiki/2021-12_security_release/FAQ (Vendor Advisory)
- security.gentoo.org/glsa/202305-24 (vendor-advisory)
Frequently asked questions
- What is CVE-2021-44857?
- CVE-2021-44857 is a medium-severity vulnerability in MediaWiki, classified under Missing Authorization. CVSS score: 6.5/10. Published 2021-12-17.
- How severe is CVE-2021-44857?
- Medium severity. CVSS v3 base score is 6.5 out of 10.