Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mediawiki | Mediawiki | < 1.34.4 |
| Fedoraproject | Fedora | 33 |
Related Weaknesses (CWE)
References
- https://commons.wikimedia.org/w/index.php?oldid=454609892#File:Wiki.pngVendor Advisory
- https://gerrit.wikimedia.org/r/q/Ib852a96afc4dca10516d0510e69c10f9892b351bPatchVendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://phabricator.wikimedia.org/T262628Issue TrackingPatchVendor Advisory
- https://commons.wikimedia.org/w/index.php?oldid=454609892#File:Wiki.pngVendor Advisory
- https://gerrit.wikimedia.org/r/q/Ib852a96afc4dca10516d0510e69c10f9892b351bPatchVendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://phabricator.wikimedia.org/T262628Issue TrackingPatchVendor Advisory
FAQ
What is CVE-2020-26121?
CVE-2020-26121 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2020-26121?
CVE-2020-26121 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-26121?
Check the references section above for vendor advisories and patch information. Affected products include: Mediawiki Mediawiki, Fedoraproject Fedora.