CVE-2026-59354

Spring Security OAuth2 Authorization Server: Insufficient validation of Dynamic Client Registration metadata

Published Aug 27, 2026 CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
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).

Remediation

Vendor Solution

Upgrade to Spring Security 7.0.5 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Vmware
Vmware spring Security
CPEs cpe:2.3:a:vmware:spring_security:*:*:*:*:*:*:*:*
Vendors & Products Vmware
Vmware spring Security
Type Values Removed Values Added
First Time appeared Vmware By Broadcom
Vmware By Broadcom spring Security (oauth2 Authorization Server Module)
Vendors & Products Vmware By Broadcom
Vmware By Broadcom spring Security (oauth2 Authorization Server Module)
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

cvssV3_1

{'score': 9.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N'}

Type Values Removed Values Added
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).
Title Spring Security OAuth2 Authorization Server: Insufficient validation of Dynamic Client Registration metadata
Weaknesses CWE-20
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
vmware
Published
Updated
Aug 28, 2026, 3:55 AM
Reserved
Jul 4, 2026, 6:14 PM
Status
Analyzed
Published
Aug 27, 2026, 10:16 AM
Modified
Sep 1, 2026, 4:01 PM