---
id: CVE-2026-8743
title: Open5GS AMF/MME context.c ran_ue_find_by_amf_ue_ngap_id improper authorization
summary: >-
  A vulnerability was found in Open5GS up to 2.7.6. This impacts the function
  ran_ue_find_by_amf_ue_ngap_id of the file src/amf/context.c of the component
  AMF/MME. Performing a manipulation results in improper authorization. It is
  possible…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-285
  - CWE-266
product: Open5GS
affected:
  - Open5GS 2.7.0
  - Open5GS 2.7.1
  - Open5GS 2.7.2
  - Open5GS 2.7.3
  - Open5GS 2.7.4
  - Open5GS 2.7.5
  - Open5GS 2.7.6
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-05-18T14:20:42.468011Z'
exploitAvailable: true
published: '2026-05-17'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T09:02:39.438Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-8743'
references:
  - url: 'https://vuldb.com/vuln/364330'
    label: >-
      VDB-364330 | Open5GS AMF/MME context.c ran_ue_find_by_amf_ue_ngap_id
      improper authorization
  - url: 'https://vuldb.com/vuln/364330/cti'
    label: 'VDB-364330 | CTI Indicators (IOB, IOC, TTP, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-8743'
    label: CVE-2026-8743 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/814559'
    label: 'Submit #814559 | Open5GS 2.7.6 Incorrect Authorization'
  - url: 'https://github.com/open5gs/open5gs/issues/4498'
  - url: 'https://github.com/open5gs/open5gs/pull/4553'
  - url: >-
      https://github.com/open5gs/open5gs/commit/5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1
  - url: 'https://github.com/open5gs/open5gs/'
tags:
  - cve.org
  - exploit-available
epss: 0.00387
epssPercentile: 0.31367
ingestedAt: '2026-10-21T09:46:15.395Z'
---

## Overview

A vulnerability was found in Open5GS up to 2.7.6. This impacts the function ran_ue_find_by_amf_ue_ngap_id of the file src/amf/context.c of the component AMF/MME. Performing a manipulation results in improper authorization. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The patch is named 5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1. It is suggested to install a patch to address this issue.

## Affected

- `Open5GS 2.7.0`
- `Open5GS 2.7.1`
- `Open5GS 2.7.2`
- `Open5GS 2.7.3`
- `Open5GS 2.7.4`
- `Open5GS 2.7.5`
- `Open5GS 2.7.6`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.