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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-59354
StatePUBLISHED
Assignervmware
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-27 10:16:36 UTC
Updated2026-08-28 18:47:30 UTC
DescriptionIn 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).

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from [email protected]

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

EPSS: 0.003730000 probability, percentile 0.301620000 (date 2026-08-29)

Problem Types: CWE-20 | CWE-20 CWE-20: Improper Input Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNACVSS9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA VMware By Broadcom Spring Security OAuth2 Authorization Server Module affected 7.0.0 7.0.4 semver Not specified
CNA VMware By Broadcom Spring Security OAuth2 Authorization Server Module unaffected 7.0.5 semver Not specified

References

ReferenceSourceLinkTags
spring.io/security/cve-2026-59354 [email protected] spring.io
nvd.nist.gov/vuln-metrics/cvss/v3-calculator [email protected] nvd.nist.gov
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Kelvin Mbogo (@addcontent) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-21T00:00:00.000ZPublic disclosure and fix released (Spring Security 7.0.5).

Solutions

CNA: Upgrade to Spring Security 7.0.5 or later.

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