CVE-2026-59354

critical · 9.6

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).

9.6

CVSS

0.5%

EPSS (exploit prob.)

42nd

EPSS percentile

2026-08-27

Published

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Weaknesses

CWE-20

Affected products

Vendor	Product	Affected versions
vmware	spring_security	>= 7.0.0, < 7.0.5

Check a specific version with /api/v1/cve/match.

References

https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N&version=3.1
https://spring.io/security/cve-2026-59354

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-59354