---
id: CVE-2026-63089
title: >-
  WireGuard Easy through 15.3.0, fixed in commit 66b292b, contains a
  cryptographically weak one-time link token generation vulnerability that
  allows unauthenticated network attackers to recover WireGuard peer credentials
  by brute-forcing a…
summary: >-
  WireGuard Easy through 15.3.0, fixed in commit 66b292b, contains a
  cryptographically weak one-time link token generation vulnerability that
  allows unauthenticated network attackers to recover WireGuard peer credentials
  by brute-forcing a…
severity: critical
cvss: 9.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N'
cwe:
  - CWE-338
  - CWE-613
published: '2026-07-16'
updated: '2026-07-18'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63089'
references:
  - url: >-
      https://github.com/wg-easy/wg-easy/commit/66b292b11bde3664f05ffb016c8082665d261ded
    label: disclosure@vulncheck.com
  - url: 'https://github.com/wg-easy/wg-easy/pull/2661'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/wireguard-easy-weak-token-generation-information-disclosure-via-otl-route
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00414
epssPercentile: 0.32961
ingestedAt: '2026-07-18T20:24:54.565Z'
---

## Overview

WireGuard Easy through 15.3.0, fixed in commit 66b292b, contains a cryptographically weak one-time link token generation vulnerability that allows unauthenticated network attackers to recover WireGuard peer credentials by brute-forcing a keyspace of at most 1000 candidate tokens per client ID, as the token is computed using CRC32 over a random value constrained to 0-999. Attackers can enumerate candidate tokens against the unauthenticated /cnf/:oneTimeLink route, which lacks rate limiting and does not validate token expiration, to obtain a peer's PrivateKey and PresharedKey and impersonate that peer on the VPN network.

## Remediation

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