How severe is CVE-2026-39937?

CVE-2026-39937 has a CVSS 4.0 base score of 8.8, rated high severity.

Is CVE-2026-39937 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-39937?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-39937 have an EU (EUVD) identifier?

Yes. CVE-2026-39937 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19984.

When was CVE-2026-39937 published?

CVE-2026-39937 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-39937

CVE-2026-39937 is a high-severity vulnerability with a CVSS 4.0 base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-212.

Key facts

Severity: High (CVSS 4.0 base score 8.8)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19984
Weakness: CWE-212
Published: 2026-04-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-39937?: 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.
How severe is CVE-2026-39937?: CVE-2026-39937 has a CVSS 4.0 base score of 8.8, rated high severity.
Is CVE-2026-39937 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-39937?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-39937 have an EU (EUVD) identifier?: Yes. CVE-2026-39937 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19984.
When was CVE-2026-39937 published?: CVE-2026-39937 was published on 2026-04-07 and last updated on 2026-06-17.

References

Other CWE-212 vulnerabilities

CVE-2022-2818 — Critical (CVSS 9.8): Improper Removal of Sensitive Information Before Storage or Transfer in GitHub repository cockpit-hq/cockpit prior to…
CVE-2020-11684 — Critical (CVSS 9.1): AT91bootstrap before 3.9.2 does not properly wipe encryption and authentication keys from memory before passing control…
CVE-2022-30617 — High (CVSS 8.8): An authenticated user with access to the Strapi admin panel can view private and sensitive data, such as email and…
CVE-2022-0355 — High (CVSS 8.8): Improper Removal of Sensitive Information Before Storage or Transfer in NPM simple-get prior to 4.0.1.
CVE-2021-0340 — High (CVSS 8.8): In parseNextBox of IsoInterface.java, there is a possible leak of unredacted location information due to improper input…
CVE-2019-13402 — High (CVSS 8.8): /usr/sbin/default.sh and /usr/apache/htdocs/cgi-bin/admin/hardfactorydefault.cgi on Dynacolor FCM-MB40 v1.2.0.0 devices…

Browse all CWE-212 vulnerabilities →