What is CVE-2023-28656?

CVE-2023-28656 is a high-severity vulnerability in F5 nginx API Connectivity Manager, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2023-05-03.

How severe is CVE-2023-28656?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in F5 nginx API Connectivity Manager

CVE-2023-28656

NGINX Management Suite may allow an authenticated attacker to gain access to configuration objects outside of their assigned environment. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2023-05-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (44.7th percentile), scored 2026-11-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

F5 nginx API Connectivity Manager — versions 1.0.0
F5 nginx API Connectivity Manager
F5 nginx Instance Manager — versions 2.0.0
F5 nginx Instance Manager
F5 nginx Security Monitoring — versions 1.0.0
F5 nginx Security Monitoring
NetApp Cloud Backup
NetApp Ontap Select Deploy

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

my.f5.com/manage/s/article/K000133417 (vendor-advisory, Vendor Advisory)
security.netapp.com/advisory/ntap-20230609-0006/ (Third Party Advisory)

Frequently asked questions

What is CVE-2023-28656?: CVE-2023-28656 is a high-severity vulnerability in F5 nginx API Connectivity Manager, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2023-05-03.
How severe is CVE-2023-28656?: High severity. CVSS v3 base score is 8.1 out of 10.