CVE-2026-63089
Weak one-time token lets attackers steal WireGuard peer keys and impersonate peers
Is CVE-2026-63089 being exploited?
Not confirmed. CVE-2026-63089 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2026-63089?
CVE-2026-63089 is rated Critical with a CVSS score of 9.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-63089?
Yes. A fix has been recorded for CVE-2026-63089. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-63089 affect?
CVE-2026-63089 affects WireGuard Easy <=15.3.0, /cnf/:oneTimeLink endpoint, WireGuard peers' key material. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-63089?
Upgrade WireGuard Easy to post-15.3.0 (commit 66b292b); restrict and rate-limit the one-time link endpoint.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attackers can brute-force CRC32-based one-time tokens to recover a peer's PrivateKey and PresharedKey and impersonate that peer on the VPN.
Immediate action required
- affected<= 15.3.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.