{"id":"CVE-2021-27279","aliases":["EUVD-2021-14044","GHSA-6483-hcpp-p75w"],"status":"published","description":"MyBB before 1.8.25 allows stored XSS via nested [email] tags with MyCode (aka BBCode).","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00959,"percentile":0.61983,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-02-22T19:04:20Z","modified":"2026-10-20T10:54:35Z","products":[{"vendor":"mybb","product":"mybb"}],"references":[{"url":"https://mybb.com/versions/1.8.25/","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","advisory"]},{"url":"https://github.com/mybb/mybb/security/advisories/GHSA-6483-hcpp-p75w","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://github.com/mybb/mybb/commit/cb781b49116bf5c4d8deca3e17498122b701677a","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix"]}],"sources":{"cve":[{"id":"CVE-2021-27279","description":"MyBB before 1.8.25 allows stored XSS via nested [email] tags with MyCode (aka BBCode).","status":"published","published":"2021-02-22T19:04:20Z","modified":"2024-08-03T20:48:16.072Z","updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-14044","description":"MyBB before 1.8.25 allows stored XSS via nested [email] tags with MyCode (aka BBCode).","status":"published","published":"2021-02-22T19:04:20Z","modified":"2024-08-03T20:48:16Z","updated_at":"2026-11-03T03:24:49.368497Z"}],"nvd":[{"id":"CVE-2021-27279","description":"MyBB before 1.8.25 allows stored XSS via nested [email] tags with MyCode (aka BBCode).","status":"published","published":"2021-02-22T20:15:13.243Z","modified":"2026-06-17T03:44:36.427Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:50.031227Z"}],"osv":[{"id":"CVE-2021-27279","description":"MyBB before 1.8.25 allows stored XSS via nested [email] tags with MyCode (aka BBCode).","status":"published","published":"2021-02-22T20:15:13.243Z","modified":"2026-10-20T10:54:35.200349794Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:18.778776Z"}]}}