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).

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Fixes

Solution

Upgrade to Spring Security 7.0.5 or later.


Workaround

No workaround given by the vendor.

History

Thu, 27 Aug 2026 13:00:00 +0000

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'}


Thu, 27 Aug 2026 09:30:00 +0000

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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: vmware

Published:

Updated: 2026-08-27T09:27:56.969Z

Reserved: 2026-07-04T18:14:46.171Z

Link: CVE-2026-59354

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-27T10:16:36.063

Modified: 2026-08-27T13:18:27.513

Link: CVE-2026-59354

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-27T11:00:06Z

Weaknesses