CVE-2023-53689

low-risk

Published 2025-10-30

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.

Do I need to act?

0.11% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 4.8/10 Medium

NETWORK / LOW complexity

Affected Products (1)

Fusion

Affected Vendors

Nagios

References (3)

Release Notes https://www.nagios.com/changelog/nagios-fusion/

Vendor Advisory https://www.nagios.com/products/security/#fusion

Third Party Advisory https://www.vulncheck.com/advisories/nagios-fusion-license-information-reflected...

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low-risk

Severity 19/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal