Vulnerability Description
In versions of Spring Security's OAuth2 Authorization Server module 7.0.0 through 7.0.4, when Dynamic Client Registration is explicitly enabled, the registration endpoint performs insufficient validation of certain client metadata fields supplied by the registering client. An attacker who possesses a valid Initial Access Token can register a malicious client with crafted metadata, which, depending on server configuration and how the metadata is later rendered or used, may result in Stored Cross-Site Scripting (XSS), Privilege Escalation, or Server-Side Request Forgery (SSRF).
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Vmware | Spring Security | >= 7.0.0, < 7.0.5 |
Related Weaknesses (CWE)
References
- https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:L/UI:N/US Government ResourceThird Party Advisory
- https://spring.io/security/cve-2026-59354Vendor Advisory
FAQ
What is CVE-2026-59354?
CVE-2026-59354 is a vulnerability with a CVSS score of 9.6 (CRITICAL). In versions of Spring Security's OAuth2 Authorization Server module 7.0.0 through 7.0.4, when Dynamic Client Registration is explicitly enabled, the registration endpoint performs insufficient validat...
How severe is CVE-2026-59354?
CVE-2026-59354 has been rated CRITICAL with a CVSS base score of 9.6/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-59354?
Check the references section above for vendor advisories and patch information. Affected products include: Vmware Spring Security.