free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the 3gpp-traffic-influence API without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can create, read, patch, and delete traffic-influence subscriptions either with no Authorization header at all, or with a forged bearer token (e.g. Authorization: Bearer not-a-real-token). This includes creating AnyUeInd=true subscriptions intended to affect group / any-UE traffic steering. The route group is also reachable even when the running config's ServiceList does not declare it, so operators who think they disabled the service via config are still exposed. This vulnerability is fixed in 4.2.2.
Metrics
Affected Vendors & Products
References
History
Thu, 28 May 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:* |
Thu, 28 May 2026 02:30:00 +0000
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| First Time appeared |
Free5gc
Free5gc free5gc |
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| Vendors & Products |
Free5gc
Free5gc free5gc |
Wed, 27 May 2026 18:30:00 +0000
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| Metrics |
ssvc
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Wed, 27 May 2026 16:30:00 +0000
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| Description | free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the 3gpp-traffic-influence API without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can create, read, patch, and delete traffic-influence subscriptions either with no Authorization header at all, or with a forged bearer token (e.g. Authorization: Bearer not-a-real-token). This includes creating AnyUeInd=true subscriptions intended to affect group / any-UE traffic steering. The route group is also reachable even when the running config's ServiceList does not declare it, so operators who think they disabled the service via config are still exposed. This vulnerability is fixed in 4.2.2. | |
| Title | free5GC: NEF 3gpp-traffic-influence API is unauthenticated; missing or forged bearer tokens can create, read, patch, and delete subscriptions | |
| Weaknesses | CWE-862 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-05-27T15:41:38.820Z
Updated: 2026-05-27T17:53:01.419Z
Reserved: 2026-05-05T19:00:06.023Z
Link: CVE-2026-44326
Updated: 2026-05-27T17:52:57.631Z
Status : Analyzed
Published: 2026-05-27T17:16:38.053
Modified: 2026-05-28T16:25:38.687
Link: CVE-2026-44326
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