What is CVE-2019-16529?

CVE-2019-16529 is a medium-severity vulnerability in MediaWiki Checkuser. CVSS score: 5.3/10. Published 2020-03-19.

How severe is CVE-2019-16529?

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

Vulnerability in MediaWiki Checkuser

CVE-2019-16529

An issue was discovered in the CheckUser extension through 1.35.0 for MediaWiki. Oversighted edit summaries are still visible in CheckUser results in violation of MediaWiki's permissions model.

Published 2020-03-19 · 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: 0.009 (58.7th percentile), scored 2026-10-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.7% 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

MediaWiki Checkuser

References

phabricator.wikimedia.org/T207094 (Permissions Required)
phabricator.wikimedia.org/rECHU22ddd638ba79903361df88c755232a532cbdbfb3 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2019-16529?: CVE-2019-16529 is a medium-severity vulnerability in MediaWiki Checkuser. CVSS score: 5.3/10. Published 2020-03-19.
How severe is CVE-2019-16529?: Medium severity. CVSS v3 base score is 5.3 out of 10.