CVE-2019-16738

Name: CVE-2019-16738
Creator: NVD / NIST
Published: 2019-09-26T02:15:10.833+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.77%

Last modified Jun 17, 2026

CVE-2019-16738 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.. EPSS estimates a 1.77% chance of exploitation in the next 30 days.

Description

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.77%

75.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	>= 1.31.0, < 1.31.4
Mediawiki	Mediawiki	>= 1.32.0, < 1.32.4
Mediawiki	Mediawiki	>= 1.33.0, < 1.33.1
Fedoraproject	Fedora	30
Fedoraproject	Fedora	31
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7OMG3BMUHGWTAPYTK2NXM6CXF6FYLOUO/Broken Link
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QBAOLXETM5BOYQG6OQVHGB2LNLZUXVN6/Broken Link
https://phabricator.wikimedia.org/T230402Exploit, Issue Tracking, Patch, Third Party Advisory
https://seclists.org/bugtraq/2019/Oct/32Mailing List, Third Party Advisory
https://www.debian.org/security/2019/dsa-4545Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7OMG3BMUHGWTAPYTK2NXM6CXF6FYLOUO/Broken Link
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QBAOLXETM5BOYQG6OQVHGB2LNLZUXVN6/Broken Link
https://phabricator.wikimedia.org/T230402Exploit, Issue Tracking, Patch, Third Party Advisory
https://seclists.org/bugtraq/2019/Oct/32Mailing List, Third Party Advisory
https://www.debian.org/security/2019/dsa-4545Third Party Advisory

Timeline

Published: Sep 26, 2019
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2019-16738?

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

How severe is CVE-2019-16738?

CVE-2019-16738 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.77% probability of exploitation in the next 30 days.

How do I fix CVE-2019-16738?

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-2019-16738?

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

Scan your code now

Source: NVD / NIST