Medium [CVE-2026-59354] Spring Security OAuth2 Authorization Server: Insufficient validation of Dynamic Client Registration metadata
This medium-severity VMware (Broadcom) advisory covers CVE-2026-59354 affecting Spring Security (OAuth2 Authorization Server module).
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Summary
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).
Affected product named by the advisory: Spring Security (OAuth2 Authorization Server module).
- Spring Security (OAuth2 Authorization Server module) 7.0.0 through 7.0.4
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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