{"id":"CVE-2021-3355","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-3355","generatedAt":"2026-10-27T21:19:06.793Z","title":"A stored-self XSS exists in LightCMS v1.3.4, allowing an attacker to execute HTML or JavaScript code in a vulnerable Title field to /admin/SensitiveWords.","description":"A stored-self XSS exists in LightCMS v1.3.4, allowing an attacker to execute HTML or JavaScript code in a vulnerable Title field to /admin/SensitiveWords.","published":"2021-02-24T15:15:14.000Z","lastModified":"2026-06-17T04:05:00.000Z","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":["lightcms project/lightcms"],"epss":{"score":0.0725,"percentile":0.94297,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2021-02-26","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":49598,"kind":"exploit","title":"LightCMS 1.3.4 - 'exclusive' Stored XSS","url":"https://www.exploit-db.com/exploits/49598","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/webapps/49598.txt","file":"exploits/multiple/webapps/49598.txt","published":"2021-02-26","added":"2021-02-26","updated":"2021-02-26","author":"Peithon","type":"webapps","platform":"multiple","port":null,"verified":false,"codes":["CVE-2021-3355"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"high","text":"A public exploit is published in Exploit-DB, so the technical barrier is gone even though the severity is medium and EPSS is 7.2%. Treat it as high on anything reachable from the internet."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/161562/LightCMS-1.3.4-Cross-Site-Scripting.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://gist.github.com/Peithon/1c628ded0c4fc96c6331c3cce1d0c69b","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/eddy8/LightCMS/issues/18","tags":["Exploit","Issue Tracking","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.exploit-db.com/exploits/49598","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://packetstormsecurity.com/files/161562/LightCMS-1.3.4-Cross-Site-Scripting.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://gist.github.com/Peithon/1c628ded0c4fc96c6331c3cce1d0c69b","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/eddy8/LightCMS/issues/18","tags":["Exploit","Issue Tracking","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/49598","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-3355","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."}