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CVE-2026-56100— SpringBlade 2.7.3 < 5.0.0 Privilege Escalation via Exposed Feign Endpoint

Quick assessment

Affected
SpringBlade SpringBlade
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.

chillzhuang SpringBlade是chillzhuang个人开发者的一款整合多项开发功能的开发框架。 chillzhuang SpringBlade 2.7.3版本至5.0.0之前版本存在授权问题漏洞，该漏洞源于未受保护的内部Feign用户创建端点暴露且缺乏授权检查，以及认证过滤器仅验证JWT解析而不验证用户角色或调用者身份，并存在硬编码JWT签名密钥，可能导致已认证攻击者通过发送特制POST请求伪造令牌、创建系统管理员账户并提升权限至管理员，造成跨租户数据污染和持久后门访问。

CVSS 8.1 · High EPSS 0.53% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
SpringBlade SpringBlade 2.7.3< 5.0.0 affected
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I. Basic Information for CVE-2026-56100

Vulnerability Information
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Vulnerability Title
SpringBlade 2.7.3 < 5.0.0 Privilege Escalation via Exposed Feign Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
SpringBlade versions from 2.7.3 up to but not including 5.0.0 contain a privilege escalation vulnerability that allows authenticated attackers to create system administrator accounts by sending crafted POST requests to an unprotected internal Feign user-creation endpoint exposed via @RestController without authorization checks. Attackers can exploit the gateway's authentication filter, which only validates JWT parsing without verifying user roles or caller identity, and leverage a hardcoded JWT signing key embedded in publicly available JARs to forge tokens and escalate privileges from a low-privilege user to administrator, enabling cross-tenant data pollution and persistent backdoor access.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
chillzhuang SpringBlade 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
chillzhuang SpringBlade是chillzhuang个人开发者的一款整合多项开发功能的开发框架。 chillzhuang SpringBlade 2.7.3版本至5.0.0之前版本存在授权问题漏洞，该漏洞源于未受保护的内部Feign用户创建端点暴露且缺乏授权检查，以及认证过滤器仅验证JWT解析而不验证用户角色或调用者身份，并存在硬编码JWT签名密钥，可能导致已认证攻击者通过发送特制POST请求伪造令牌、创建系统管理员账户并提升权限至管理员，造成跨租户数据污染和持久后门访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
SpringBlade SpringBlade 2.7.3 ~ 5.0.0 -

II. Public POCs for CVE-2026-56100

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III. Intelligence Information for CVE-2026-56100

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Patches & Fixes for CVE-2026-56100 (1)

Vendor Advisories for CVE-2026-56100 (1)

Vendor Pages for CVE-2026-56100 (1)

IV. Related Vulnerabilities

Same product: SpringBlade
Same weakness: CWE-862

V. Comments for CVE-2026-56100

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