CVE-2026-27806
Fleet Affected by Local Privilege Escalation via Tcl Command Injection in Orbit
Description
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.
INFO
Published Date :
April 8, 2026, 7:25 p.m.
Last Modified :
July 25, 2026, 11:10 a.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Upgrade Fleet to version 4.81.1 or newer.
- Apply vendor patches for the Orbit agent.
- Review user password handling in scripts.
- Ensure proper input sanitization.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-27806.
| URL | Resource |
|---|---|
| https://github.com/fleetdm/fleet/security/advisories/GHSA-rphv-h674-5hp2 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-27806 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-27806
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-27806 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-27806 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 25, 2026
Action Type Old Value New Value Added Translation Title: Fleet de Fleetdm, Description: Fleet es software de gestión de dispositivos de código abierto. Antes de la versión 4.81.1, el flujo de rotación de claves de cifrado de disco FileVault del agente Orbit recopila la contraseña de un usuario local a través de un diálogo de GUI y la intercala directamente en un script Tcl/expect ejecutado mediante exec.Command("expect", "-c", script). Debido a que la contraseña se inserta en el comando Tcl send {%s} entre llaves, una contraseña que contiene } termina el literal e inyecta comandos Tcl arbitrarios. Dado que Orbit se ejecuta como root, esto permite a un usuario local sin privilegios escalar a privilegios de root. Esta vulnerabilidad se corrigió en la versión 4.81.1. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'fleetdm', 'product': 'fleet', 'versions': [{'status': 'affected', 'version': '< 4.81.1'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-27806', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-04-09T14:24:06.342149Z'} -
Initial Analysis by [email protected]
Apr. 14, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:* versions up to (excluding) 4.81.1 Added Reference Type GitHub, Inc.: https://github.com/fleetdm/fleet/security/advisories/GHSA-rphv-h674-5hp2 Types: Vendor Advisory -
New CVE Received by [email protected]
Apr. 08, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-78 Added Reference https://github.com/fleetdm/fleet/security/advisories/GHSA-rphv-h674-5hp2