Vulnerability · Published Jan 23, 2026 · Assigned by mitre
CVE-2025-66719
Critical 9.1
In plain English
A critical-severity incorrect authorization in the github.com/free5gc/nrf package (Go). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/free5gc/nrf | 1.4.1 | GHSA-q7c8-gfjh-8v4p |
| Go | github.com/free5gc/nrf | 1.4.1 | GO-2026-5570 |
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N