CVE-2021-43786CWE-287

API token verification can be bypassed

Critical · published November 29, 2021

CVSS v3.1
9.8
EPSS
2%
Percentile
83.7
In the wild
Unconfirmed
What it is

🚨 A sneaky logic flaw in NodeBB lets anyone grab the master token with just a trick! 🔥 Think of it like a restaurant where anyone can order from the secret menu without any checks — the staff just hands over those special dishes without verifying who they’re talking to. This flaw in the token verification step means unauthorized users could access sensitive API functions as if they were the masters themselves! This could lead to an attacker wielding far too much power — accessing, modifying, or even deleting data within your forum. The potential for a full compromise is absolutely devastating! Imagine the chaos if someone could take over your entire community without breaking a sweat.

Put simply

Think of it like a restaurant where anyone can order from the secret menu without any checks — the staff just hands over those special dishes without verifying who they’re talking to. This flaw in the token verification step means unauthorized users could access sensitive API functions as if they were the masters themselves! CVE-2021-43786 occurs due to incorrect logic in how NodeBB handles token verification, unintentionally allowing unauthorized access to master tokens in the API. As a result, attackers can interact with the system with elevated privileges they shouldn’t have.

What to do

This could lead to an attacker wielding far too much power — accessing, modifying, or even deleting data within your forum. The potential for a full compromise is absolutely devastating! Imagine the chaos if someone could take over your entire community without breaking a sweat. Update your NodeBB installation to version 1.18.5 immediately to close this critical vulnerability. Additionally, review your API access controls to ensure proper validation is in place moving forward. Don’t let this slip — patch now! You've got this! Fixing this vulnerability will help keep your forum safe and sound. 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.02369 · 83.7th percentile
Weakness
CWE-287 · Improper Authentication
Published
2021-11-29T19:30Z
EPSS history
Timeline
  • 29 NOV 19:30Z
    API token verification can be bypassed
    cvelistv5