GHSA-RPHV-H674-5HP2

Vulnerability from github – Published: 2026-04-08 18:03 – Updated: 2026-04-08 18:03
VLAI?
Summary
Fleet Affected by Local Privilege Escalation via Tcl Command Injection in Orbit
Details

Summary

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.

CWE

  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  • CWE-94: Improper Control of Generation of Code ('Code Injection')

Impact

  • Local privilege escalation to root: Any unprivileged local user on a managed endpoint can execute arbitrary commands as root

Credit

This vulnerability was discovered and reported by bugbunny.ai.

Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fleetdm/fleet/v4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.81.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-27806"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-78"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-08T18:03:52Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nThe Orbit agent\u0027s FileVault disk encryption key rotation flow on collects a local user\u0027s 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.\n\n## CWE\n\n- **CWE-78**: Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)\n- **CWE-94**: Improper Control of Generation of Code (\u0027Code Injection\u0027)\n\n## Impact\n\n- Local privilege escalation to root: Any unprivileged local user on a managed endpoint can execute arbitrary commands as root\n\n## Credit\n\nThis vulnerability was discovered and reported by [bugbunny.ai](https://bugbunny.ai).",
  "id": "GHSA-rphv-h674-5hp2",
  "modified": "2026-04-08T18:03:52Z",
  "published": "2026-04-08T18:03:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-rphv-h674-5hp2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/fleetdm/fleet"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Fleet Affected by Local Privilege Escalation via Tcl Command Injection in Orbit"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.