CVE-2026-42083
HighSummary
In versions prior to 4.2.2, the missing authentication middleware in PCF Npcf_SMPolicyControl allows unauthenticated access to SM policy handlers and disclosure of subscriber SUPI. As a result, requests to certain endpoints can be processed without a valid OAuth token.
Risk Assessment
The organization is at risk of unauthorized access to sensitive subscriber data, which could lead to serious privacy breaches and data security issues.
Recommendation
It is recommended to upgrade to version 4.2.2 or later to secure the system against these authorization vulnerabilities.
Original NVD description (English source)
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, PCF Npcf_SMPolicyControl missing authentication middleware allows unauthenticated access to SM policy handlers and disclosure of subscriber SUPI. In NewServer(), the smPolicyGroup route group is created and routes are applied without attaching the router authorization middleware. In contrast, other PCF service groups such as Npcf_PolicyAuthorization do attach RouterAuthorizationCheck before route registration. Because the middleware is missing, requests to the /npcf-smpolicycontrol/v1/sm-policies, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}, /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/update, and /npcf-smpolicycontrol/v1/sm-policies/{smPolicyId}/delete endpoints can reach business logic even when no valid OAuth token is provided. This vulnerability is fixed in 4.2.2.