CVE-2026-59354 VMware by Broadcom CVE debrief

Who should care

Administrators and users of Spring Security's OAuth2 Authorization Server module, particularly those with Dynamic Client Registration enabled, should be aware of this vulnerability and take necessary precautions to prevent potential attacks.

Technical 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).

Defensive priority

Critical vulnerability in Spring Security's OAuth2 Authorization Server module, requiring immediate attention due to potential for Stored Cross-Site Scripting (XSS), Privilege Escalation, or Server-Side Request Forgery (SSRF).

Recommended defensive actions

• Apply vendor-provided patches or updates to Spring Security's OAuth2 Authorization Server module.
• Restrict access to the registration endpoint.
• Implement additional security measures to detect and prevent potential attacks.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

Evidence from official CVE Program record and NIST NVD detail page indicates vulnerability in Spring Security's OAuth2 Authorization Server module versions 7.0.0 through 7.0.4. Insufficient validation of client metadata fields allows for potential Stored Cross-Site Scripting (XSS), Privilege Escalation, or Server-Side Request Forgery (SSRF).

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.