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CVE-2026-5749— Inadequate access control vulnerability in Fullstep

Quick assessment

Affected
Fullstep Fullstep
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.

Fullstep是Fullstep公司的一个企业采购与供应链管理平台。 Fullstep V5版本存在访问控制错误漏洞，该漏洞源于注册过程中访问控制不足，可能导致未经身份验证的用户获取有效JWT令牌，从而与认证API资源交互，影响资源机密性。

AI Predicted 9.1 Difficulty: Easy EPSS 0.27% · P19

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5749

Vulnerability Information
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Vulnerability Title
Inadequate access control vulnerability in Fullstep
Source: CVE Program / CVE List V5
Vulnerability Description
Inadequate access control in the registration process in Fullstep V5, which could allow unauthenticated users to obtain a valid JWT token with which to interact with authenticated API resources. Successful exploitation of this vulnerability could allow an unauthenticated attacker to compromise the confidentiality of the affected resource, provided they have a valid token with which to interact with the API.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Fullstep 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fullstep是Fullstep公司的一个企业采购与供应链管理平台。 Fullstep V5版本存在访问控制错误漏洞，该漏洞源于注册过程中访问控制不足，可能导致未经身份验证的用户获取有效JWT令牌，从而与认证API资源交互，影响资源机密性。
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
Fullstep Fullstep 5 -

II. Public POCs for CVE-2026-5749

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III. Intelligence Information for CVE-2026-5749

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IV. Related Vulnerabilities

Same product: Fullstep
Same vendor: Fullstep
Same weakness: CWE-306