Vulnerability-Lookup

CVE-2026-27806 (GCVE-0-2026-27806)

Vulnerability from cvelistv5 – Published: 2026-04-08 17:40 – Updated: 2026-04-09 14:24

Title

Fleet Affected by Local Privilege Escalation via Tcl Command Injection in Orbit

Summary

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.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/fleetdm/fleet/security/advisor…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
fleetdm	fleet	Affected: < 4.81.1

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-27806

Vulnerability from fkie_nvd - Published: 2026-04-08 19:25 - Updated: 2026-06-17 10:27

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/fleetdm/fleet/security/advisories/GHSA-rphv-h674-5hp2	Vendor Advisory

Impacted products

	Vendor	Product	Version
	fleetdm	fleet	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "fleet",
          "vendor": "fleetdm",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.81.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
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    {
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        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "09CFBED5-C6C2-4CCB-A48C-7E89E878E4F7",
              "versionEndExcluding": "4.81.1",
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      "lang": "en",
      "value": "Fleet is open source device management software. Prior to 4.81.1, the 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. This vulnerability is fixed in 4.81.1."
    }
  ],
  "id": "CVE-2026-27806",
  "lastModified": "2026-06-17T10:27:42.890",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
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          "baseScore": 7.8,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
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GHSA-RPHV-H674-5HP2

Vulnerability from github – Published: 2026-04-08 18:03 – Updated: 2026-06-26 20:20

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

Show details on source website

JSON

To clipboard

{
  "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": "2026-04-08T19:25:13Z",
    "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": "2026-06-26T20:20:10Z",
  "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"
}

WID-SEC-W-2026-1015

Vulnerability from csaf_certbund - Published: 2026-04-08 22:00 - Updated: 2026-04-08 22:00

Summary

Fleet: Schwachstelle ermöglicht Privilegieneskalation

Severity

Mittel

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: Fleet ist eine Open-Source-Plattform zur Geräteverwaltung, die es Unternehmen ermöglicht, ihre Infrastruktur zu überwachen und zu sichern.

Angriff: Ein lokaler Angreifer kann eine Schwachstelle in Fleet ausnutzen, um seine Privilegien zu erhöhen.

Betroffene Betriebssysteme: - Linux - UNIX

CVE-2026-27806

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source Fleet <4.81.1 Open Source / Fleet		<4.81.1

References

3 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/fleetdm/fleet/security/advisor…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Fleet ist eine Open-Source-Plattform zur Ger\u00e4teverwaltung, die es Unternehmen erm\u00f6glicht, ihre Infrastruktur zu \u00fcberwachen und zu sichern.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein lokaler Angreifer kann eine Schwachstelle in Fleet ausnutzen, um seine Privilegien zu erh\u00f6hen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1015 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1015.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1015 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1015"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-rphv-h674-5hp2 vom 2026-04-08",
        "url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-rphv-h674-5hp2"
      }
    ],
    "source_lang": "en-US",
    "title": "Fleet: Schwachstelle erm\u00f6glicht Privilegieneskalation",
    "tracking": {
      "current_release_date": "2026-04-08T22:00:00.000+00:00",
      "generator": {
        "date": "2026-04-09T09:39:04.371+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2026-1015",
      "initial_release_date": "2026-04-08T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-04-08T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c4.81.1",
                "product": {
                  "name": "Open Source Fleet \u003c4.81.1",
                  "product_id": "T052534"
                }
              },
              {
                "category": "product_version",
                "name": "4.81.1",
                "product": {
                  "name": "Open Source Fleet 4.81.1",
                  "product_id": "T052534-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:fleetdm:fleet:4.81.1"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Fleet"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-27806",
      "product_status": {
        "known_affected": [
          "T052534"
        ]
      },
      "release_date": "2026-04-08T22:00:00.000+00:00",
      "title": "CVE-2026-27806"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-27806 (GCVE-0-2026-27806)

FKIE_CVE-2026-27806

GHSA-RPHV-H674-5HP2

Summary

CWE

Impact

Credit

WID-SEC-W-2026-1015

Tags

Sightings

Nomenclature