Quick answers
- Is CVE-2026-105789 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-105789 being exploited in the wild.
- How severe is CVE-2026-105789?
- Medium severity, with a CVSS score of 5.4, published 6 October 2026.
- Which products and versions are affected?
- Microsoft UFO before 3.0.9.
- Is there a fix for CVE-2026-105789?
- Yes: fixed in 3.0.9. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-105789 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-105789?
- Check whether you run Microsoft UFO at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 3.0.9
Technical details
The Linux MCP server in UFO's execute_command tool incorrectly classifies sort and uniq as read-only commands while allowing their file-output variants (sort -o, uniq's second operand) through its argument policy. An authenticated attacker can leverage these to write arbitrary files with the UFO process's privileges without using shell metacharacters. The vulnerability is present in ufo/client/mcp/http_servers/linux_mcp_server.py prior to version 3.0.9.
Affected products
- Microsoft UFO before 3.0.9
Timeline
- 2026-10-06: disclosed
- 2026-09-02: patched