CVE-2025-66719: Free5gc NRF is vulnerable to scope validation bypass via maliciously crafted targetNF value
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/accesstoken.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.
Published Jan 23, 2026 · Updated Jun 5, 2026
Affected packages
github.com/free5gc/nrf
- Ecosystem
- Go
- Affected
- < 1.4.1
- Fixed in
- 1.4.1
- Check
go list -m github.com/free5gc/nrf
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
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.
Credited to p0sql.
References
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology