CVE-2025-66719: FREE5GC Nrf

Critical severity, CVSS 9.1. EPSS: 0.4% chance of exploitation in the next 30 days.

An issue was discovered in Free5gc NRF 1.4.0. In the access-token generation logic of free5GC, the AccessTokenScopeCheck() function in file internal/sbi/processor/access_token.go bypasses all scope validation when the attacker uses a crafted targetNF value. This allows attackers to obtain an access token with any arbitrary scope.

Affected products

• FREE5GC Nrf: version 1.4.0 only

Published 2026-01-23. Last modified 2026-06-17.