CVE-2019-18611

Name: CVE-2019-18611
Creator: NVD / NIST
Published: 2019-10-29T19:15:19.843+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.93%

Last modified Jun 17, 2026

CVE-2019-18611 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An issue was discovered in the CheckUser extension through 1.34 for MediaWiki. Certain sensitive information within oversighted edit summaries made available via the MediaWiki API was potentially visible to users with various levels of access to this extension. EPSS estimates a 0.93% chance of exploitation in the next 30 days.

Description

An issue was discovered in the CheckUser extension through 1.34 for MediaWiki. Certain sensitive information within oversighted edit summaries made available via the MediaWiki API was potentially visible to users with various levels of access to this extension. Said users should not have been able to view these oversighted edit summaries via the MediaWiki API.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.93%

55.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Mediawiki	Checkuser	<= 1.34

References

https://gerrit.wikimedia.org/r/q/Ie0aa0df2b3f03d8b910733f1b5e600a0dc978765Patch, Vendor Advisory
https://phabricator.wikimedia.org/T234862Patch, Vendor Advisory
https://gerrit.wikimedia.org/r/q/Ie0aa0df2b3f03d8b910733f1b5e600a0dc978765Patch, Vendor Advisory
https://phabricator.wikimedia.org/T234862Patch, Vendor Advisory

Timeline

Published: Oct 29, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18611?

How severe is CVE-2019-18611?

CVE-2019-18611 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.93% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18611?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-18611?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST