CVE-2021-35479

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 13.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-07-30 · updated 2026-06-17
Weakness: CWE-79

Description

Nagios Log Server before 2.1.9 contains Stored XSS in the custom column view for the alert history and audit log function through the affected pp parameter. This affects users who open a crafted link or third-party web page.

Affected products

Nagios Log Server: before 2.1.9 — fixed in 2.1.9

How to fix

Upgrade to a fixed version: Nagios Log Server 2.1.9. Check the vendor advisory for mitigations.

References

https://research.nccgroup.com/2021/07/22/technical-advisory-stored-and-reflected-xss-vulnerability-in-nagios-log-server-cve-2021-35478cve-2021-35479/
https://research.nccgroup.com/?research=Technical%20advisories
https://www.nagios.com/downloads/nagios-log-server/change-log/
https://research.nccgroup.com/2021/07/22/technical-advisory-stored-and-reflected-xss-vulnerability-in-nagios-log-server-cve-2021-35478cve-2021-35479/
https://research.nccgroup.com/?research=Technical%20advisories
https://www.nagios.com/downloads/nagios-log-server/change-log/

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