Medium 6.8Published Jun 9, 2026

CVE-2026-47838Unauthorized User Impersonation when Using X.509 Client Certificates

Updated under an hour ago (Oct 27, 2026, 7:23 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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 impersonating another user. Affected versions: Spring Security 5.7.0 through 5.7.24; 5.8.0 through 5.8.26; 6.3.0 through 6.3.17; 6.4.0 through 6.4.17; 6.5.0 through 6.5.10.

CVSS: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-287
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: vmware
NVD analysis: Analyzed
Record last updated: Jun 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Spring Spring Security spring:security (from the name)	from 5.7.0 before 5.7.25; from 5.8.0 before 5.8.27; from 6.3.0 before 6.3.18; from 6.4.0 before 6.4.18; from 6.5.0 before 6.5.10.2	CNA record
vmware spring_security vmware:spring_security	before 5.7.25; from 5.8.0 before 5.8.27; from 6.3.0 before 6.3.18; from 6.4.0 before 6.4.18; from 6.5.0 before 6.5.11	NVD

References

References

https://spring.io/security/cve-2026-47838	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.