---
id: CVE-2026-120007
title: NodeBB 1.18.0 through 4.16.5 Authorization Bypass via /register/complete uid
summary: >-
  NodeBB 1.18.0 through 4.16.5 contains an authorization bypass vulnerability
  that allows unauthenticated visitors to act on other accounts by supplying a
  uid during POST /register. Attackers can submit an empty email at the
  /register/comp…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-639
vendor: NodeBB
product: NodeBB
affected:
  - NodeBB >= 1.18.0 <= 4.16.5
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-30T19:42:32.089286Z'
published: '2026-10-30'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T19:42:51.208Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120007'
references:
  - url: >-
      https://github.com/NodeBB/NodeBB/commit/376d14abb7fffd8ea14f3a2f96baa20ffee5cdb3
    label: Patch Commit
  - url: >-
      https://github.com/NodeBB/NodeBB/blob/c3d8dc512292a376f19e06cb93512bdff2505102/src/controllers/authentication.js#L34
    label: Registration body saved to session (4.16.5)
  - url: >-
      https://github.com/NodeBB/NodeBB/blob/c3d8dc512292a376f19e06cb93512bdff2505102/src/user/interstitials.js#L124
    label: Email interstitial removal on attacker-chosen uid (4.16.5)
  - url: 'https://github.com/NodeBB/NodeBB'
  - url: >-
      https://www.vulncheck.com/advisories/nodebb-1.18.0-through-4.16.5-authorization-bypass-via-register-complete-uid
    label: >-
      VulnCheck Advisory: NodeBB 1.18.0 through 4.16.5 Authorization Bypass via
      /register/complete uid
tags:
  - cve.org
epss: 0.00338
epssPercentile: 0.27366
ingestedAt: '2026-11-05T16:24:31.416Z'
---

## Overview

NodeBB 1.18.0 through 4.16.5 contains an authorization bypass vulnerability that allows unauthenticated visitors to act on other accounts by supplying a uid during POST /register. Attackers can submit an empty email at the /register/complete interstitial to clear a victim's email and confirmation state and revoke all their sessions.

## Affected

- `NodeBB >= 1.18.0 <= 4.16.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.