CVE-2026-22747
Spring Security Vulnerable to Unauthorized User Impersonation when Using X.509 Client Certificates
6.8
MEDIUM
CVSS 3.1
EPSS 0.03%
Description
Vulnerability in Spring Spring Security. SubjectX500PrincipalExtractor 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. This issue affects Spring Security: from 7.0.0 through 7.0.4.
How to fix CVE-2026-22747
To remediate CVE-2026-22747, upgrade the affected package to a fixed version below.
- —upgrade to 7.0.5 or later
Is CVE-2026-22747 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 7.0.0, < 7.0.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.8 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |