CVE-2025-43866— Vantage6 Server JWT secret not cryptographically secure
Quick assessment
Affected
vantage6 vantage6
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.
vantage6是vantage6开源的一个用于 Secure Insight eXchange 的开源 priVAcy preserviNg federalTed leArningG 基础架构。 vantage6 4.11.0之前版本存在安全特征问题漏洞，该漏洞源于JWT密钥自动生成不安全，可能导致密钥预测。
Possible ATT&CK Techniques 1 AI
T1552 · Unsecured Credentials
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I. Basic Information for CVE-2025-43866
Vulnerability Information
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Vulnerability Title
Vantage6 Server JWT secret not cryptographically secure
Source: CVE Program / CVE List V5
Vulnerability Description
vantage6 is an open-source infrastructure for privacy preserving analysis. The JWT secret key in the vantage6 server is auto-generated unless defined by the user. The auto-generated key is a UUID1, which is not cryptographically secure as it is predictable to some extent. This vulnerability is fixed in 4.11.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
使用不充分的随机数
Source: CVE Program / CVE List V5
Vulnerability Title
vantage6 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vantage6是vantage6开源的一个用于 Secure Insight eXchange 的开源 priVAcy preserviNg federalTed leArningG 基础架构。 vantage6 4.11.0之前版本存在安全特征问题漏洞，该漏洞源于JWT密钥自动生成不安全，可能导致密钥预测。
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
II. Public POCs for CVE-2025-43866
| # | POC Description | Source Link | Shenlong Link |
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IV. Related Vulnerabilities
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CVE-2026-73652
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Same vendor: vantage6
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CVE-2026-73652
vantage6: Algorithm developer can edit another developer's a -
CVE-2026-54533
vantage6 node has an Improper Access Control issue -
CVE-2026-54445
Vantage6: Set admin user and password from environment or co -
CVE-2024-27928
Vantage6: 2FA can be circumvented with hacked email access -
CVE-2024-24769
Vantage6: No limit on emails sent for password/MFA reset
Same weakness: CWE-330
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V. Comments for CVE-2025-43866
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