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CVE

CVE-2026-59354

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

CVE-2026-59354

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

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).

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
C
H
U
9.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Related Resources

No items found.

References

https://repo.maven.apache.org/maven2/org/springframework/security/spring-security-oauth2-authorization-server/, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59354.json, https://nvd.nist.gov/vuln/detail/CVE-2026-59354, https://spring.io/security/cve-2026-59354, 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

Severity

9.6

CVSS Score
0
10

Basic Information

Base CVSS
9.6
EPSS Probability
0.0049%
EPSS Percentile
0.40197%
Introduced Version
1d99a7fb14c62354cac00412cce2071892cdf465,7.0.0
Fix Available
53bc6a77963209bb2a5f3efdd855b1f4a8051cc3,7.0.5

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