🛡️ CVE-2026-27806 — fleet

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-78 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Fleet Affected by Local Privilege Escalation via Tcl Command Injection in Orbit

Summary

The Orbit agent's FileVault disk encryption key rotation flow on collects a local user's password via a GUI dialog and interpolates it directly into a Tcl/expect script executed via exec.Command("expect", "-c", script). Because the password is inserted into Tcl brace-quoted send {%s}, a password containing } terminates the literal and injects arbitrary Tcl commands. Since Orbit runs as root, this allows a local unprivileged user to escalate to root privileges.

CWE

  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  • CWE-94: Improper Control of Generation of Code ('Code Injection')

Impact

  • Local privilege escalation to root: Any unprivileged local user on a managed endpoint can execute arbitrary commands as root

Credit

This vulnerability was discovered and reported by [bugbunny.ai](https://bugbunny.ai).

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-27806 is classified as CWE-78: OS Command Injection. Untrusted input reaches a shell command without neutralisation, so an attacker can run arbitrary operating system commands.

Affected software

CVE-2026-27806 is recorded against 2 packages.

  • fleet (fixed in 4.81.1)
  • github.com/fleetdm/fleet/v4

Timeline and source

Published on 8 April 2026 and last revised on 25 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-78
Public Exploit ✅ No
Source NVD
Published 2026-04-08
Updated 2026-08-12
Modified 2026-07-25
Fix URL N/A

Affected Packages

Software From version Fixed in
fleet — 4.81.1
github.com/fleetdm/fleet/v4 — —

Similar Threats

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