CVE-2026-59354— Spring Security OAuth2 Authorization Server: Insufficient validation of Dynamic Client Registration metadata
Quick assessment
Affected
VMware by Broadcom Spring Security (OAuth2 Authorization Server module)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 Spring Security OAuth2 授权服务器模块 7.0.0 到 7.0.4 版本中，当显式启用了动态客户端注册（Dynamic Client Registration）时，注册端点对注册客户端提供的某些客户端元数据字段执行了不充分的验证。拥有有效初始访问令牌（Initial Access Token）的攻击者可以注册一个包含经过构造的元数据的恶意客户端。根据服务器配置以及元数据后续如何被渲染或使用，这可能导致存储型跨站脚本攻击（Stored XSS）、权限提升或服务器端请求伪造（SSRF）。
Possible ATT&CK Techniques 2 AI
T1189 · Drive-by Compromise T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-59354
Vulnerability Information
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Vulnerability Title
Spring Security OAuth2 Authorization Server: Insufficient validation of Dynamic Client Registration metadata
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| VMware by Broadcom | Spring Security (OAuth2 Authorization Server module) | 7.0.0 ~ 7.0.4 | - |
|
II. Public POCs for CVE-2026-59354
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-59354 (1)
-
🔗 NVD CVSS v3 Calculator technical-description
Vendor Pages for CVE-2026-59354 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-59354
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