What is the severity of CVE-2021-30156?

CVE-2021-30156 has been classified as a medium severity vulnerability.

How do I fix CVE-2021-30156?

To fix CVE-2021-30156, upgrade MediaWiki to version 1.35.2 or later.

Which versions of MediaWiki are affected by CVE-2021-30156?

CVE-2021-30156 affects MediaWiki versions before 1.31.12 and between 1.32.0 and 1.35.2.

Can CVE-2021-30156 affect Fedora users?

Yes, CVE-2021-30156 can affect Fedora versions 33 and 34 if they are running affected MediaWiki versions.

What does CVE-2021-30156 exploit?

CVE-2021-30156 can exploit the Special:Contributions feature to leak the existence of 'hidden' users.

Vulnerability/
CVE-2021-30156

medium

4.3

CWE

200

9/4/2021

3/8/2024

CVE-2021-30156: Infoleak

First published: Fri Apr 09 2021(Updated: )

An issue was discovered in MediaWiki before 1.31.12 and 1.32.x through 1.35.x before 1.35.2. Special:Contributions can leak that a "hidden" user exists.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Wikimedia MediaWiki	<1.31.12
Wikimedia MediaWiki	>=1.32.0<1.35.2
Fedoraproject Fedora	=33
Fedoraproject Fedora	=34

Remedy

https://phabricator.wikimedia.org/T276306

Never miss a vulnerability like this again

Reference Links

Frequently Asked Questions

What is the severity of CVE-2021-30156?
CVE-2021-30156 has been classified as a medium severity vulnerability.
How do I fix CVE-2021-30156?
To fix CVE-2021-30156, upgrade MediaWiki to version 1.35.2 or later.
Which versions of MediaWiki are affected by CVE-2021-30156?
CVE-2021-30156 affects MediaWiki versions before 1.31.12 and between 1.32.0 and 1.35.2.
Can CVE-2021-30156 affect Fedora users?
Yes, CVE-2021-30156 can affect Fedora versions 33 and 34 if they are running affected MediaWiki versions.
What does CVE-2021-30156 exploit?
CVE-2021-30156 can exploit the Special:Contributions feature to leak the existence of 'hidden' users.

agent/type
agent/weakness
agent/severity
agent/author
agent/remedy
agent/softwarecombine
agent/description
collector/mitre-cve
source/MITRE
agent/references
agent/last-modified-date
agent/first-publish-date
agent/event
agent/source
agent/tags
collector/nvd-index
agent/software-canonical-lookup-request
vendor/mediawiki
canonical/wikimedia mediawiki
version/wikimedia mediawiki/1.32.0
vendor/fedoraproject
canonical/fedoraproject fedora
version/fedoraproject fedora/33
version/fedoraproject fedora/34

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.

Frequently Asked Questions

What is the severity of CVE-2021-30156?
CVE-2021-30156 has been classified as a medium severity vulnerability.
How do I fix CVE-2021-30156?
To fix CVE-2021-30156, upgrade MediaWiki to version 1.35.2 or later.
Which versions of MediaWiki are affected by CVE-2021-30156?
CVE-2021-30156 affects MediaWiki versions before 1.31.12 and between 1.32.0 and 1.35.2.
Can CVE-2021-30156 affect Fedora users?
Yes, CVE-2021-30156 can affect Fedora versions 33 and 34 if they are running affected MediaWiki versions.
What does CVE-2021-30156 exploit?
CVE-2021-30156 can exploit the Special:Contributions feature to leak the existence of 'hidden' users.