CVE-2026-44326Public exploitNetwork attack vector

Unauthenticated traffic-policy manipulation via unprotected NEF routes

Published May 27, 2026 · Updated May 27, 2026

Missing authorization in free5GC NEF before 4.2.2 allows remote attackers to alter traffic-influence subscriptions over the SBI. NEF mounts the traffic-influence route group without inbound OAuth2 enforcement and dispatches missing or forged bearer tokens to CRUD handlers. Remote attackers who can reach the SBI can read, create, modify, or delete traffic-steering policy, including any-UE subscriptions, even when ServiceList omits the route group.

CVSS severity9.4
Critical
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in free5GC NEF before 4.2.2 allows remote attackers to alter traffic-influence subscriptions over the SBI. NEF mounts the traffic-influence route group without inbound OAuth2 enforcement and dispatches missing or forged bearer tokens to CRUD handlers. Remote attackers who can reach the SBI can read, create, modify, or delete traffic-steering policy, including any-UE subscriptions, even when ServiceList omits the route group.

The record

CVE
CVE-2026-44326
Published
May 27, 2026
Updated
May 27, 2026
Vendor
free5GC
Product
free5GC
Classifications
CWE-862, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

free5GC · free5GCversion=< 4.2.2

Published CVSS scores

9.4GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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