Improper Authentication in Spring Security - CVE-2026-47838
Published: July 26, 2026
Vulnerability identifier: #VU139383
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-47838
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: VMware, Inc
Affected software:
Spring Security
Spring Security
Detailed vulnerability description
The vulnerability allows a remote user to impersonate another user.
The vulnerability exists due to improper authentication in SubjectDnX509PrincipalExtractor when processing malformed X.509 certificate CN values. A remote user can present a carefully crafted certificate to impersonate another user.
The issue can cause the extractor to read the wrong value for the username.
How to mitigate CVE-2026-47838
Install security update from vendor's website.