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. It arises from improper handling of a local user's password in the Orbit agent's FileVault disk encryption key rotation flow. The password is interpolated directly into a Tcl/expect script, allowing a specially crafted password containing the '}' character to inject arbitrary Tcl commands. Because the Orbit agent runs with root privileges, this vulnerability allows local unprivileged users to escalate privileges to root. The issue is fixed in Fleet version 4.81.1.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-27806) affects Fleet versions before 4.81.1. It is an OS command injection flaw stemming from improper neutralization of special elements (CWE-78) in the Orbit agent component. Specifically, the local user's password is embedded within Tcl brace-quoted send commands without adequate sanitization. A password containing the '}' character prematurely terminates the Tcl literal, enabling injection of arbitrary Tcl commands. Since the Orbit agent operates with root privileges, exploitation allows local privilege escalation to root. The vulnerability has a CVSS 3.1 score of 7.8, reflecting high severity. The issue is resolved in Fleet version 4.81.1.
Potential Impact
Successful exploitation permits a local unprivileged user to execute arbitrary Tcl commands with root privileges via the Orbit agent, resulting in full system compromise. Confidentiality, integrity, and availability of the affected system are all impacted.
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. No other official remediation or temporary fixes are documented. Patch status is confirmed by the vendor advisory stating the fix in 4.81.1.
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. It arises from improper handling of a local user's password in the Orbit agent's FileVault disk encryption key rotation flow. The password is interpolated directly into a Tcl/expect script, allowing a specially crafted password containing the '}' character to inject arbitrary Tcl commands. Because the Orbit agent runs with root privileges, this vulnerability allows local unprivileged users to escalate privileges to root. The issue is fixed in Fleet version 4.81.1.
CVSS v3.1
Score 7.8high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-27806) affects Fleet versions before 4.81.1. It is an OS command injection flaw stemming from improper neutralization of special elements (CWE-78) in the Orbit agent component. Specifically, the local user's password is embedded within Tcl brace-quoted send commands without adequate sanitization. A password containing the '}' character prematurely terminates the Tcl literal, enabling injection of arbitrary Tcl commands. Since the Orbit agent operates with root privileges, exploitation allows local privilege escalation to root. The vulnerability has a CVSS 3.1 score of 7.8, reflecting high severity. The issue is resolved in Fleet version 4.81.1.
Potential Impact
Successful exploitation permits a local unprivileged user to execute arbitrary Tcl commands with root privileges via the Orbit agent, resulting in full system compromise. Confidentiality, integrity, and availability of the affected system are all impacted.
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. No other official remediation or temporary fixes are documented. Patch status is confirmed by the vendor advisory stating the fix in 4.81.1.
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: 04/09/2026, 05:19:55 UTC
Last enriched: 06/26/2026, 22:09:27 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 78
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