CVE-2026-47838
Unauthorized User Impersonation when Using X.509 Client Certificates
CVSS Score
6.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-287 |
| Vendor | spring |
| Product | spring security |
| Ecosystems | |
| Industries | TechnologyEnterprise |
| Published | Jun 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Spring / Spring Security
5.7.0 < 5.7.25 5.8.0 < 5.8.27 6.3.0 < 6.3.18 6.4.0 < 6.4.18 6.5.0 < 6.5.11