CVE-2026-59354 — Spring Security OAuth2 Authorization Server: Insufficient validation of Dynamic Client Registration metadata
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 perfor…
Published: 2026-08-27 · CVSS: 9.6 · CVSS 3.1
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).
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7