{"id":"CVE-2021-35478","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-35478","generatedAt":"2026-10-27T18:48:55.789Z","title":"Nagios Log Server before 2.1.9 contains Reflected XSS in the dropdown box for the alert history and audit log function.","description":"Nagios Log Server before 2.1.9 contains Reflected XSS in the dropdown box for the alert history and audit log function. All parameters used for filtering are affected. This affects users who open a crafted link or third-party web page.","published":"2021-07-30T14:15:18.000Z","lastModified":"2026-06-17T03:57:33.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":["nagios/log server"],"epss":{"score":0.76624,"percentile":0.9954,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 76.6%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"https://research.nccgroup.com/2021/07/22/technical-advisory-stored-and-reflected-xss-vulnerability-in-nagios-log-server-cve-2021-35478cve-2021-35479/","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://research.nccgroup.com/?research=Technical%20advisories","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.nagios.com/downloads/nagios-log-server/change-log/","tags":["Release Notes","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://research.nccgroup.com/2021/07/22/technical-advisory-stored-and-reflected-xss-vulnerability-in-nagios-log-server-cve-2021-35478cve-2021-35479/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://research.nccgroup.com/?research=Technical%20advisories","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.nagios.com/downloads/nagios-log-server/change-log/","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-35478","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}