Vulnerability · Published Aug 17, 2026 · Assigned by GitHub_M

CVE-2026-54336JumpServer: KoKo Web Terminal SFTP Path Traversal on Authorized Asset

Medium 5.4

In plain English

A medium-severity path traversal in jumpserver from jumpserver. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 72.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
jumpserver	jumpserver	>= 4.8.0, < 4.10.17

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

https://github.com/jumpserver/jumpserver/security/advisories/GHSA-x6rg-36j6-76vr x_refsource_CONFIRM
https://github.com/jumpserver/koko/commit/02fabebe27dacce89114fba122c667a946fd12ea x_refsource_MISC
https://github.com/jumpserver/koko/releases/tag/v4.10.17 x_refsource_MISC