Improper Authorization in Open5GS AMF/MME Component
CVE-2026-8743

5.3MEDIUM

Key Information:

Vendor

Open5GS

Status
Open5gs
Vendor
CVE Published:
17 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-8743?

A vulnerability exists in Open5GS, specifically affecting the AMF/MME component's function ran_ue_find_by_amf_ue_ngap_id. This flaw allows attackers to manipulate the function and gain unauthorized access remotely. The exploit has been disclosed publicly, posing a significant risk. A patch is available (commit 5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1) to mitigate the issue, and it is strongly recommended that users update their systems to secure their environments.

Affected Version(s)

Open5GS 2.7.0

Open5GS 2.7.1

Open5GS 2.7.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-8743 - Proof of Concept

References

https://vuldb.com/vuln/364330
vdb-entrytechnical-description
https://vuldb.com/vuln/364330/cti
signaturepermissions-required
https://vuldb.com/submit/814559
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jinha Kim (ICSR_KMU)
Seungjoon Na (VulDB User)
Seungjoon Na (VulDB User)
.