High severity · published Apr 7, 2026
CVE-2026-39937
Global vanishing does not completely remove user email
8.8
CVSS
0.3%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MC
Mediawiki - CentralAuth Extension · The Wikimedia Foundation
before 1.43 · source: vendor
Affected product
MC
Mediawiki - CentralAuth Extension
The Wikimedia Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-39937
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-39937
gerrit.wikimedia.org
https://gerrit.wikimedia.org/r/q/I0b72427fa329aee85841a2cb23dec3058edce85e
phabricator.wikimedia.org
https://phabricator.wikimedia.org/T418122
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