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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.

SpringBlade 版本 2.7.3 至 3.5.0 存在一个权限提升漏洞。已认证的 attacker（攻击者）可以通过向一个未受保护的、通过 暴露的内部 Feign 用户创建接口发送经过构造的 POST 请求，从而创建系统管理员账户，该接口缺少权限校验。攻击者可以利用网关的认证过滤器——该过滤器仅验证 JWT 的解析，却不校验用户角色或调用方身份——并结合公开 JAR 包中硬编码的 JWT 签名密钥，伪造 JWT token，从而将低权限用户提升为管理员权限。这可能导致跨租户数据污染以及持久化的后门访问。

CVSS 8.1 · High

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 2.7.3 through 3.5.0 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

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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Vendor Advisories for CVE-2026-56100 (1)

Vendor Pages for CVE-2026-56100 (1)

Other References 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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