TI-2023-23378 Aliases CVE-2023-43652

Non-MFA account takeover via using only SSH public key to login in jumpserver

HIGH 78CWE-862Published 2023-09-27 · Updated 2025-03-25

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-862.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00814 57th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed jumpserver (jumpserver): 2.28.20, 3.7.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
jumpserver	jumpserver	2.0.0 to before 2.28.20; 3.0.0 to before 3.7.1	2.28.20, 3.7.1	Patch available	CNA

jumpserver Vendorjumpserver Affected 2.0.0 to before 2.28.20; 3.0.0 to before 3.7.1 Fixed in 2.28.20, 3.7.1 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:fit2cloud:jumpserver::::::::	2.0.0 to before 2.28.20; 3.0.0 to before 3.7.1	Vulnerable	1Panel-dev

cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:* Versions 2.0.0 to before 2.28.20; 3.0.0 to before 3.7.1 Vulnerable ·1Panel-dev

Remediation

Fix · CNA jumpserver (jumpserver) Fixed in 2.28.20, 3.7.1

Timeline

2026-10-02 Threatist record created from CVE-2023-43652

References

Exploit 1

https://github.com/jumpserver/jumpserver/security/advisories/GHSA-fr8h-xh5x-r8g9

Other 1

https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2

TI-2024-27040 Arbitrary File Read in Ansible Playbooks in Jumpserver CVSS 3.1CRITICAL 10.0
TI-2023-22607 JumpServer session replays download without authentication CVSS 3.1HIGH 8.2
TI-2024-27041 Arbitrary File Write in Ansible Playbooks leads to RCE in Jumpserver CVSS 3.1CRITICAL 10.0
TI-2024-19371 JumpServer vulnerable to Jinja2 template injection in Ansible leads to RCE in Celery CVSS 3.1CRITICAL 10.0
TI-2024-19370 JumpServer's insecure Ansible playbook validation leads to RCE in Celery CVSS 3.1CRITICAL 10.0
TI-2023-23377 Remote code execution on the host system via MongoDB shell in jumpserver CVSS 3.1CRITICAL 9.9

See all 27 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences