CVE-2023-29137

4.3 mediumEPSS 0.4%

Medium (4.3) in mediawiki mediawiki. EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

4.3 medium

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 37% of CVEs (scores of 2026-10-31)
CWE: CWE-200
Published: 2023-03-31
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mediawiki:mediawiki

References

https://phabricator.wikimedia.org/T328643
https://phabricator.wikimedia.org/T328643

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