Vulnerability · Published Apr 8, 2026 · Assigned by GitHub_M

CVE-2026-27806Fleet Affected by Local Privilege Escalation via Tcl Command Injection in Orbit

High 7.8

In plain English

A high-severity OS command injection in fleet from fleetdm. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High

Exploit odds (30 days)0.1%top 98.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/fleetdm/fleet/v4	4.81.1	GHSA-rphv-h674-5hp2
Go	github.com/fleetdm/fleet/v4	4.81.1	GO-2026-5634

Affected products (as reported)

Vendor	Product	Versions
fleetdm	fleet	< 4.81.1

Weakness: CWE-78 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/fleetdm/fleet/security/advisories/GHSA-rphv-h674-5hp2 x_refsource_CONFIRM