Medium severity · published Aug 17, 2026
CVE-2026-54336
JumpServer: KoKo Web Terminal SFTP Path Traversal on Authorized Asset
5.4
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JU
jumpserver · jumpserver
>= 4.8.0, < 4.10.17 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-54336
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-54336
github.com
https://github.com/jumpserver/jumpserver/security/advisories/GHSA-x6rg-36j6-76vr
github.com
https://github.com/jumpserver/koko/commit/02fabebe27dacce89114fba122c667a946fd12ea
github.com
https://github.com/jumpserver/koko/releases/tag/v4.10.17
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