Vulnerability in Wg-Easy
CVE-2026-63089
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.
EPSS: 0.004 (34.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N.
Affected products
- Wg-easy — versions 0, 66b292b11bde3664f05ffb016c8082665d261ded
Weakness classification (CWE)
References
- disclosure@vulncheck.com (issue-tracking)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-63089?
- CVE-2026-63089 is a critical-severity vulnerability in Wg-Easy, classified under Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG). CVSS score: 9.3/10. Published 2026-07-16.
- How severe is CVE-2026-63089?
- Critical severity. CVSS v3 base score is 9.3 out of 10.