What is CVE-2020-25813?

CVE-2020-25813 is a medium-severity vulnerability in MediaWiki. CVSS score: 5.3/10. Published 2020-09-27.

How severe is CVE-2020-25813?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in MediaWiki

CVE-2020-25813

In MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4, Special:UserRights exposes the existence of hidden users.

Published 2020-09-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.2th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

MediaWiki
Fedoraproject Fedora — versions 33

References

meta.wikimedia.org/wiki/Special:UserRights (Vendor Advisory)
lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html (Mailing List, Vendor Advisory)
lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html (Mailing List, Vendor Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)

Frequently asked questions

What is CVE-2020-25813?: CVE-2020-25813 is a medium-severity vulnerability in MediaWiki. CVSS score: 5.3/10. Published 2020-09-27.
How severe is CVE-2020-25813?: Medium severity. CVSS v3 base score is 5.3 out of 10.