PT-2026-31406 · Fleet · Fleet

Bugbunny-Research · Published 2026-04-08 · Updated 2026-04-08 · CVE-2026-27806

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Fleet versions prior to 4.81.1

Description The Orbit agent’s FileVault disk encryption key rotation flow 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.

Recommendations Update to Fleet version 4.81.1 or later.

Fix

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

CVE-2026-27806

GHSA-RPHV-H674-5HP2

Affected Products

Fleet

References · 5

• https://github.com/fleetdm/fleet/security/advisories/GHSA-rphv-h674-5hp2 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27806 · Security Note
• https://osv.dev/vulnerability/GHSA-rphv-h674-5hp2 · Vendor Advisory
• https://github.com/fleetdm/fleet · Note
• https://twitter.com/CVEnew/status/2041975612483477639 · Twitter Post