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CVE-2023-43652— Non-MFA account takeover via using only SSH public key to login in jumpserver

Quick assessment

Affected
jumpserver jumpserver
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Jumpserver是中国杭州飞致云信息科技有限公司的一款开源堡垒机。 JumpServer 存在安全漏洞，该漏洞源于可以使用用户名和 SSH 公钥对核心 API 进行身份验证，而无需密码或相应的 SSH 私钥。

CVSS 8.2 · High EPSS 0.81% · P56

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2023-43652

Vulnerability Information
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Vulnerability Title
Non-MFA account takeover via using only SSH public key to login in jumpserver
Source: CVE Program / CVE List V5
Vulnerability Description
JumpServer is an open source bastion host. As an unauthenticated user, it is possible to authenticate to the core API with a username and an SSH public key without needing a password or the corresponding SSH private key. An SSH public key should be considered public knowledge and should not used as an authentication secret alone. JumpServer provides an API for the KoKo component to validate user private key logins. This API does not verify the source of requests and will generate a personal authentication token. Given that public keys can be easily leaked, an attacker can exploit the leaked public key and username to authenticate, subsequently gaining access to the current user's information and authorized actions. This issue has been addressed in versions 2.28.20 and 3.7.1. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
JumpServer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jumpserver是中国杭州飞致云信息科技有限公司的一款开源堡垒机。 JumpServer 存在安全漏洞，该漏洞源于可以使用用户名和 SSH 公钥对核心 API 进行身份验证，而无需密码或相应的 SSH 私钥。
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
jumpserver jumpserver >= 2.0.0, < 2.28.20 -

II. Public POCs for CVE-2023-43652

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5589 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2023-43652

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Vendor Advisories for CVE-2023-43652 (1)

Security Blog Posts for CVE-2023-43652 (1)

Same Patch Batch · jumpserver · 2023-09-27 · 4 CVEs total

CVE-2023-43651 8.6 HIGH Remote code execution on the host system via MongoDB shell in jumpserver
CVE-2023-43650 8.2 HIGH Non-MFA account takeover via brute-force attack on weak password reset code in jumpserver
CVE-2023-42818 5.4 MEDIUM SSH public key login without private key challenge if mfa is enabled in jumpserver

IV. Related Vulnerabilities

Same product: jumpserver
Same vendor: jumpserver
Same weakness: CWE-862

V. Comments for CVE-2023-43652

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