CVE-2026-54336

Received Received - Intake

Path Traversal in JumpServer via KoKo Web Terminal SFTP

Publication date: 2026-08-17

Last updated on: 2026-08-17

Assigner: GitHub, Inc.

Description

JumpServer is an open source bastion host and an operation and maintenance security audit system. From 4.8.0 until 4.10.17, an authenticated user with SFTP permission to an authorized asset can submit crafted traversal paths through the KoKo Web Terminal SFTP feature, causing AssetDir.GetRealPath() in pkg/srvconn/sftp_asset.go to resolve paths outside the intended SFTP root and permit read, list, write, rename, or delete operations under the configured backend account on that asset. This issue is fixed in version 4.10.17.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-17

Last Modified

2026-08-17

Generated

2026-08-18

AI Q&A

2026-08-18

EPSS Evaluated

N/A

NVD

CVE-2026-54336

Affected Vendors & Products

Vendor	Product	Version / Range
jumpserver	jumpserver	From 4.8.0 (inc) to 4.10.17 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-22	The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

Executive Summary

This vulnerability affects JumpServer, an open source bastion host and security audit system. It allows an authenticated user with SFTP permission to submit crafted path traversal inputs through the KoKo Web Terminal SFTP feature. This can cause the system to resolve paths outside the intended SFTP root directory, enabling unauthorized read, list, write, rename, or delete operations on the backend asset under the user's account.

Detection Guidance

Detecting this vulnerability requires checking JumpServer versions between 4.8.0 and 4.10.17. Verify the installed version using commands like 'jumpserver version' or checking package metadata. Inspect SFTP access logs for unauthorized path traversal attempts in the KoKo Web Terminal SFTP feature.

Impact Analysis

If exploited, this vulnerability could allow an attacker with SFTP access to manipulate files outside the intended directory. This may lead to unauthorized data access, modification, or deletion on the affected asset. The impact depends on the permissions of the backend account used for SFTP operations.

Mitigation Strategies

Upgrade JumpServer to version 4.10.17 or later immediately. Temporarily restrict SFTP permissions for users until the upgrade is complete. Monitor SFTP access logs for suspicious activity during the transition period.

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