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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (34.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Wg-Easy — versions 0, 66b292b11bde3664f05ffb016c8082665d261ded
Weakness classification (CWE)
References
- github.com/wg-easy/wg-easy/pull/2661 (issue-tracking)
- github.com/wg-easy/wg-easy/commit/66b292b11bde3664f05ffb016c8082665d261ded (patch)
- www.vulncheck.com/advisories/wireguard-easy-weak-token-generation-information-d… (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.