CVE-2026-44327

Published: Mag 27, 2026 Last Modified: Mag 27, 2026

ExploitDB:

Other exploit source:

Google Dorks:

CRITICAL 10,0

Source: [email protected]

Attack Vector: network

Attack Complexity: low

Privileges Required: none

User Interaction: none

Scope: changed

Confidentiality: low

Integrity: high

Availability: high

Description

AI Translation Available

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-oam route group without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can hit the OAM route with no Authorization header at all and the handler returns 200 OK. The current OAM handler is a stub that returns null, but the structural defect is route-group-scoped: the entire OAM route group has no inbound auth middleware, so every future OAM operation added to this group inherits the missing auth boundary by default. This vulnerability is fixed in 4.2.2.

306

Missing Authentication for Critical Function

Draft

Abstraction: Base Structure: Simple

Common Consequences

Security Scopes Affected:

Access Control Other

Potential Impacts:

Gain Privileges Or Assume Identity Varies By Context

Applicable Platforms

Technologies: Cloud Computing, ICS/OT

Likelihood of Exploit: High

View CWE Details

862

Missing Authorization

Incomplete

Abstraction: Class Structure: Simple

Common Consequences

Security Scopes Affected:

Confidentiality Integrity Access Control Availability

Potential Impacts:

Read Application Data Read Files Or Directories Modify Application Data Modify Files Or Directories Gain Privileges Or Assume Identity Bypass Protection Mechanism Dos: Crash, Exit, Or Restart Dos: Resource Consumption (Cpu) Dos: Resource Consumption (Memory) Dos: Resource Consumption (Other)