CVE-2026-27806: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in fleetdm fleet
CVE-2026-27806 is an OS command injection vulnerability in the Fleet open source device management software prior to version 4. 81. 1. The issue occurs in the Orbit agent's FileVault disk encryption key rotation flow, where a local user's password is collected and directly interpolated into a Tcl/expect script. Because the password is inserted within Tcl brace-quoted send commands, a password containing the character '}' can terminate the literal early and inject arbitrary Tcl commands. Since the Orbit agent runs with root privileges, this allows a local unprivileged user to escalate privileges to root. This vulnerability is fixed in Fleet version 4. 81. 1.
AI Analysis
Technical Summary
Fleet versions prior to 4.81.1 contain an OS command injection vulnerability (CWE-78) in the Orbit agent component. The vulnerability arises from improper neutralization of special elements in a local user's password, which is interpolated directly into a Tcl/expect script executed via exec.Command. Specifically, the password is inserted into a Tcl brace-quoted send command, and if the password includes the '}' character, it prematurely terminates the literal and enables injection of arbitrary Tcl commands. Because the Orbit agent runs as root, exploitation allows local privilege escalation from an unprivileged user to root. The vulnerability has a CVSS 3.1 base score of 7.8 (high severity) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The issue is resolved in Fleet version 4.81.1.
Potential Impact
A local unprivileged user can exploit this vulnerability to execute arbitrary Tcl commands with root privileges, resulting in full system compromise. Confidentiality, integrity, and availability of the affected system are all impacted due to the ability to escalate privileges to root. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
This vulnerability is fixed in Fleet version 4.81.1. Users should upgrade to version 4.81.1 or later to remediate this issue. Patch status is not explicitly stated in the vendor advisory content, but the description confirms the fix is included in 4.81.1. No additional mitigations are specified.
CVE-2026-27806: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in fleetdm fleet
Description
CVE-2026-27806 is an OS command injection vulnerability in the Fleet open source device management software prior to version 4. 81. 1. The issue occurs in the Orbit agent's FileVault disk encryption key rotation flow, where a local user's password is collected and directly interpolated into a Tcl/expect script. Because the password is inserted within Tcl brace-quoted send commands, a password containing the character '}' can terminate the literal early and inject arbitrary Tcl commands. Since the Orbit agent runs with root privileges, this allows a local unprivileged user to escalate privileges to root. This vulnerability is fixed in Fleet version 4. 81. 1.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Fleet versions prior to 4.81.1 contain an OS command injection vulnerability (CWE-78) in the Orbit agent component. The vulnerability arises from improper neutralization of special elements in a local user's password, which is interpolated directly into a Tcl/expect script executed via exec.Command. Specifically, the password is inserted into a Tcl brace-quoted send command, and if the password includes the '}' character, it prematurely terminates the literal and enables injection of arbitrary Tcl commands. Because the Orbit agent runs as root, exploitation allows local privilege escalation from an unprivileged user to root. The vulnerability has a CVSS 3.1 base score of 7.8 (high severity) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The issue is resolved in Fleet version 4.81.1.
Potential Impact
A local unprivileged user can exploit this vulnerability to execute arbitrary Tcl commands with root privileges, resulting in full system compromise. Confidentiality, integrity, and availability of the affected system are all impacted due to the ability to escalate privileges to root. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
This vulnerability is fixed in Fleet version 4.81.1. Users should upgrade to version 4.81.1 or later to remediate this issue. Patch status is not explicitly stated in the vendor advisory content, but the description confirms the fix is included in 4.81.1. No additional mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-02-24T02:31:33.267Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d736fb1cc7ad14da418a9e
Added to database: 4/9/2026, 5:19:55 AM
Last enriched: 4/16/2026, 12:19:51 PM
Last updated: 5/25/2026, 11:49:12 AM
Views: 46
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