CVE-2023-29137

Name: CVE-2023-29137
Creator: NVD / NIST
Published: 2023-03-31T19:15:07.43+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.44%

Last modified Jun 17, 2026

CVE-2023-29137 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. An issue was discovered in the GrowthExperiments extension for MediaWiki through 1.39.3. The UserImpactHandler for GrowthExperiments inadvertently returns the timezone preference for arbitrary users, which can be used to de-anonymize users.. EPSS estimates a 0.44% chance of exploitation in the next 30 days.

Description

An issue was discovered in the GrowthExperiments extension for MediaWiki through 1.39.3. The UserImpactHandler for GrowthExperiments inadvertently returns the timezone preference for arbitrary users, which can be used to de-anonymize users.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.44%

34.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	<= 1.39.3

References

https://phabricator.wikimedia.org/T328643Issue Tracking, Patch
https://phabricator.wikimedia.org/T328643Issue Tracking, Patch

Timeline

Published: Mar 31, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-29137?

How severe is CVE-2023-29137?

CVE-2023-29137 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.

How do I fix CVE-2023-29137?

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-2023-29137?

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

Scan your code now

Source: NVD / NIST