CVE-2025-66719: Free5gc NRF is vulnerable to scope validation bypass via maliciously crafted targetNF value

January 23, 2026 (updated June 5, 2026)

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.

References

github.com/advisories/GHSA-q7c8-gfjh-8v4p
github.com/free5gc/free5gc/issues/733
github.com/free5gc/free5gc/issues/736
github.com/free5gc/nrf/pull/73
nvd.nist.gov/vuln/detail/CVE-2025-66719

Code Behaviors & Features

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