{"id":"CVE-2021-27949","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-27949","generatedAt":"2026-10-27T20:20:04.120Z","title":"Cross-site Scripting vulnerability in MyBB before 1.8.26 via Custom moderator tools.","description":"Cross-site Scripting vulnerability in MyBB before 1.8.26 via Custom moderator tools.","published":"2021-03-15T18:15:19.000Z","lastModified":"2026-06-17T03:45:40.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":["mybb/mybb"],"epss":{"score":0.00692,"percentile":0.52625,"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":"low","text":"Lower severity and a low EPSS score (0.69%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/mybb/mybb/security/advisories/GHSA-cmmr-39v8-8rx2","tags":["Patch","Release Notes","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/mybb/mybb/security/advisories/GHSA-cmmr-39v8-8rx2","tags":["Patch","Release Notes","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-27949","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."}