What is CVE-2026-47838?

CVE-2026-47838 is a medium-severity vulnerability in Spring Security, classified under Improper Authentication. CVSS score: 6.8/10. Published 2026-06-10.

How severe is CVE-2026-47838?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Auth bypass in Spring Security

CVE-2026-47838

SubjectDnX509PrincipalExtractor does not correctly handle certain malformed X.509 certificate CN values, which can lead to reading the wrong value for the username. In a carefully crafted certificate, this can lead to an attacker impersona…

Vulnerability class: Broken Authentication

EPSS: 0.001 (1.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Spring Security — versions 5.7.0, 5.8.0, 6.3.0
Vmware Spring_security

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

security@vmware.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-47838?: CVE-2026-47838 is a medium-severity vulnerability in Spring Security, classified under Improper Authentication. CVSS score: 6.8/10. Published 2026-06-10.
How severe is CVE-2026-47838?: Medium severity. CVSS v3 base score is 6.8 out of 10.