CVE-2026-27806CWE-78

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

High · published April 8, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
1.4
In the wild
Unconfirmed
What it is

Fleet is open source device management software. Prior to 4.81.1, 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. This vulnerability is fixed in 4.81.1.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00114 · 1.4th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-04-08T17:40Z
EPSS history
Timeline
  • 08 APR 17:40Z
    Fleet Affected by Local Privilege Escalation via Tcl Command Injection in Orbit
    cvelistv5