SBA Token Forgery

In telecom networks, SBA Token Forgery is the creation, replay, or scope-escalation of OAuth2 access tokens used between 5G Network Functions. A producer NF that does not properly validate the issuer, audience, scope, and signature of an access token can be tricked into serving unauthorized requests, leaking subscriber data or modifying sessions.

Categories: Core NetworkIdentity and SubscriberSecurity Controls

SBA Token Forgery in context

The mobile core carries subscriber sessions, mobility and policy. In 4G it is the EPC (MME, HSS, S/PGW); in 5G it is the Service-Based Architecture with AMF, SMF, UPF, AUSF, UDM and the NRF.

Subscriber identifiers (IMSI, SUPI, MSISDN, IMEI) anchor authentication, charging and lawful interception. Any protocol that leaks a permanent identifier is treated as a privacy defect, which is why 5G introduced SUCI concealment on the air interface.

To place SBA Token Forgery in the wider telecom-security picture, review NIST, UDM, WPA, WPA3, 2G and 5G SBA — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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