CVE-2026-44320

Description

free5GC's NEF nnef-callback route group is unauthenticated; forged callback requests are accepted into the processing path

Overview

State

—

Assigner (CNA)

—

CVSS severity

high

CVSS score

7.3 / 10

CVSS vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Effective score

7.3 / 10 HIGH source: CNA overview

CWE(s)

—

Reserved

—

Published

—

Last updated

—

Source

https://www.tenable.com/cve/CVE-2026-44320

Linked Threat

CVE-2026-44320 — CVE-2026-44320

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2026-32578

Assigner

GitHub_M

Published

May 27, 2026, 3:48:22 PM

Updated

May 27, 2026, 5:44:48 PM

EUVD base score (CVSS 3.1)

7.3 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EUVD-reported EPSS

0.2400

Vendors

Free5Gc

Products

Free5GC (< 4.2.2)

Aliases

GHSA-wqfh-gq79-j8mf

ENISA description: free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-callback route group without inbound OAuth2/bearer-token authorization. A forged or arbitrary bearer token (e.g. Authorization: Bearer not-a-real-token) is enough to reach the SMF-callback handler -- the callback body is parsed and dispatched into NEF business logic instead of being rejected at the auth boundary. Same root cause as the other NEF SBI findings: the route group is mounted without any inbound auth middleware. NEF does not authenticate the producer NF identity before processing callback content; if an attacker can guess or obtain a valid NotifId, this missing auth boundary lets forged callbacks act on real subscription state. The route group is also reachable even when the runtime ServiceList does not declare it (it lists only nnef-pfdmanagement and nnef-oam). This vulnerability is fixed in 4.2.2.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (6)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://github.com/free5gc/free5gc/issues/860 tenable:github.com
• https://github.com/free5gc/free5gc/security/advisories/GHSA-wqfh-gq79-j8mf tenable:github.com
• https://github.com/free5gc/nef/pull/24 tenable:github.com
• https://www.first.org/epss/ tenable:www.first.org
• https://nvd.nist.gov/vuln/detail/CVE-2026-44320 tenable:nvd.nist.gov
• https://www.cve.org/CVERecord?id=CVE-2026-44320 tenable:www.cve.org

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

• THREAT ADVISORY RedSun Zero-Day (Windows Defender) April 17, 2026
  web:blackswan-cybersecurity.com

  Cloud Files API activity originating outside legitimate OneDrive/sync processes. Mitigation Steps: Apply all Windows updates immediately (monitor MSRC for an emergency RedSun-specific patch . None released as of April 17, 2026 ). Supplement Defender with a secondary EDR solution (e.g., Huntress) capable of detecting Defender bypasses.

  2026-05-26 02:48 UTC
• Security Advisory Bulletin 064 | Ubiquiti Community
  web:community.ui.com

  Published: May 21, 2026 Updated: May 22, 2026 Version: 1.1 Revision: 1.1 Summary 1 of 5 A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection. Affected Products: UniFi OS Server (Version 5.0.6 and earlier) Mitigation : Update your UniFi OS Server to Version 5.0.8 or later ...

  2026-05-26 02:48 UTC
• CVE Database Search & Remediation Guidance | CVEDatabase.com
  web:cvedatabase.com

  Search and analyze CVE vulnerabilities with instant access to CVSS scores, affected products, and remediation guidance.

  2026-05-26 02:48 UTC
• Security Update Guide - Microsoft
  web:msrc.microsoft.com

  The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

  2026-05-26 02:48 UTC
• Landing Page | ServiceNow Common Vulnerabilities & Exposures (CVE ...
  web:support.servicenow.com

  Overview The advisories below document publicly disclosed Common Vulnerabilities and Exposures ( CVEs ) in the Now Platform by ServiceNow. Because ServiceNow uses various methods to communicate vulnerability information, patches, and other fixes, customers should review family, security patch , and hotfix release notes, which are available at https://docs.servicenow.com, for a complete list of ...

  2026-05-26 02:48 UTC
• April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike
  web:www.crowdstrike.com

  Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

  2026-05-26 02:48 UTC
• April 2026 ArcGIS Security Bulletin - Esri
  web:www.esri.com

  Key highlights Portal for ArcGIS Security 2026 Update 1 Patch Portal for ArcGIS 11.4, 11.5, and 12.0 require a security patch US CISA recommends applying Critical Security patches within 15 days Patch /update resets potentially over-scoped developer credentials Check if your applications/scripts using developer credentials are fully operational after update

  2026-05-26 02:48 UTC
• National Vulnerability Database | NIST
  web:www.nist.gov

  NIST maintains the National Vulnerability Database (NVD), a repository of information on software and hardware flaws that can compromise computer security. This is a key piece of the nation's cybersecurity infrastructure.

  2026-05-26 02:48 UTC
• Oracle Critical Patch Update Advisory - April 2026
  web:www.oracle.com

  This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

  2026-05-26 02:48 UTC
• CVE 2026 — The Vulnerabilities That Matter Most Right Now
  web:www.penligent.ai

  Second, chipset and OEM dependencies make remediation slower and messier than software-only patching. Google's bulletin explains the two Android patch levels for March 2026 and clarifies that devices with security patch levels of 2026 -03-01 or 2026 -03-05 are protected against the associated issues, depending on applicable components.

  2026-05-26 02:48 UTC

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