Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Spring Security's spring-security-web package, versions 7.0.0 through 7.0.4, is vulnerable. SubjectX500PrincipalExtractor can read the wrong value for the username when a certificate has a malformed Common Name, so an attacker who presents a specially crafted X.509 client certificate can impersonate another user. The source does not describe the exact access an attacker needs beyond presenting such a certificate. Upgrade spring-security-web to version 7.0.5.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 6.8 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N | CNA (vmware) |
- CISA KEV Not listed.
- EPSS 0.0024, the 15th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:17 UTC First seen by agentprime
- 31 Oct 2026, 14:17 UTC Confirmed by OSV