What is CVE-2023-40931?

CVE-2023-40931 is a medium-severity vulnerability in Nagios Xi, classified under SQL Injection. CVSS score: 6.5/10. Published 2023-09-19.

How severe is CVE-2023-40931?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2023-40931 known to be exploited?

9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SQL Injection in Nagios Xi

CVE-2023-40931

A SQL injection vulnerability in Nagios XI from version 5.11.0 up to and including 5.11.1 allows authenticated attackers to execute arbitrary SQL commands via the ID parameter in the POST request to /nagiosxi/admin/banner_message-ajaxhelper.php

Vulnerability class: SQL Injection

Published 2023-09-19 · last modified 2026-07-09.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.119 (96.0th percentile), scored 2026-10-02.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.113 · newest: 0.119 · change: +0.006

Affected products

Nagios Xi

Weakness classification (CWE)

CWE-89 — SQL Injection

Public proof-of-concept exploits

References

af854a3a-2127-422b-91ae-364da2661108 (Product)
www.nagios.com/products/security/ (Vendor Advisory)
outpost24.com/blog/nagios-xi-vulnerabilities/ (Third Party Advisory)

Frequently asked questions

What is CVE-2023-40931?: CVE-2023-40931 is a medium-severity vulnerability in Nagios Xi, classified under SQL Injection. CVSS score: 6.5/10. Published 2023-09-19.
How severe is CVE-2023-40931?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2023-40931 known to be exploited?: 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.