{"id":"CVE-2021-41866","aliases":["EUVD-2021-28866"],"status":"published","description":"MyBB before 1.8.28 allows stored XSS because the displayed Template Name value in the Admin CP's theme management is not escaped properly.","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":"2026-11-11","score":0.00493,"percentile":0.42824,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-10-26T21:25:47Z","modified":"2026-06-17T04:09:02Z","products":[{"vendor":"mybb","product":"mybb"}],"references":[{"url":"https://github.com/mybb/mybb/security/advisories/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://github.com/mybb/mybb/security/advisories/GHSA-gxhv-r3m5-6qv7","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory"]}],"sources":{"cve":[{"id":"CVE-2021-41866","description":"MyBB before 1.8.28 allows stored XSS because the displayed Template Name value in the Admin CP's theme management is not escaped properly.","status":"published","published":"2021-10-26T21:25:47Z","modified":"2024-08-04T03:22:25.53Z","updated_at":"2026-11-02T14:32:59.430294Z"}],"euvd":[{"id":"EUVD-2021-28866","description":"MyBB before 1.8.28 allows stored XSS because the displayed Template Name value in the Admin CP's theme management is not escaped properly.","status":"published","published":"2021-10-26T21:25:47Z","modified":"2024-08-04T03:22:25Z","updated_at":"2026-11-03T03:24:16.784119Z"}],"nvd":[{"id":"CVE-2021-41866","description":"MyBB before 1.8.28 allows stored XSS because the displayed Template Name value in the Admin CP's theme management is not escaped properly.","status":"published","published":"2021-10-26T22:15:08.207Z","modified":"2026-06-17T04:09:02.003Z","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":"2026-11-02T14:07:00.549994Z"}]}}