CVE-2026-39937: Global vanishing does not completely remove user email

Severity: high (CVSS 8.8 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-07 · updated 2026-07-21
Weakness: CWE-212

Description

Improper removal of sensitive information before storage or transfer vulnerability in The Wikimedia Foundation Mediawiki - CentralAuth Extension allows Resource Leak Exposure. The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

Affected products

Wikimedia Foundation Mediawiki - CentralAuth Extension: before 1.43 — fixed in 1.43

How to fix

Upgrade to a fixed version: Wikimedia Foundation Mediawiki - CentralAuth Extension 1.43. Check the vendor advisory for mitigations.

References

https://gerrit.wikimedia.org/r/q/I0b72427fa329aee85841a2cb23dec3058edce85e
https://phabricator.wikimedia.org/T418122

Get alerted when CVE-2026-39937 or the next vulnerability affects your stack