XSS in Nagios Fusion
CVE-2023-7312
Nagios Fusion versions prior to 4.2.0 contain a stored cross-site scripting (XSS) vulnerability when adding or configuring Email Settings. Unsanitized user input can be stored and later rendered in the administrative UI, causing JavaScript to execute in the browser of any user who views the affected page. An attacker who can add or modify SMTP/email settings or manipulate the sendmail configuration fields could persist a malicious payload that executes in the context of other users' browsers.
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: 0.009 (59.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · 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, Product, patch)
- www.vulncheck.com/advisories/nagios-fusion-email-settings-stored-xss-via-smtp-s… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2023-7312?
- CVE-2023-7312 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-2023-7312?
- Medium severity. CVSS v3 base score is 4.8 out of 10.