XSS in Nagios Fusion
CVE-2023-53689
Nagios Fusion versions prior to 4.2.0 contain a reflected cross-site scripting (XSS) vulnerability in the license key configuration flow that can result in execution of attacker-controlled script in the browser of a user who follows a crafted URL. While the application server itself is not directly corrupted by the reflected XSS, the resulting browser compromise can lead to credential/session theft and unauthorized administrative actions.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.008 (55.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Nagios Fusion — versions 0
Weakness classification (CWE)
References
- www.nagios.com/products/security/ (vendor-advisory, patch, Vendor Advisory)
- www.nagios.com/changelog/nagios-fusion/ (release-notes, Release Notes, patch)
- www.vulncheck.com/advisories/nagios-fusion-license-information-reflected-xss (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2023-53689?
- CVE-2023-53689 is a medium-severity vulnerability in Nagios Fusion, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2025-10-30.
- How severe is CVE-2023-53689?
- Medium severity. CVSS v3 base score is 4.8 out of 10.