{"id":"CVE-2021-23836","aliases":["EUVD-2021-10764","GHSA-2843-wghw-w3qp"],"status":"published","title":"An issue was discovered in flatCore before 2.0.0 build 139. A stored XSS vulnerability was...","description":"An issue was discovered in flatCore before 2.0.0 build 139. A stored XSS vulnerability was identified in the prefs_smtp_psw HTTP request body parameter for the acp interface. An admin user can inject malicious client-side script into the affected parameter without any form of input sanitization. The injected payload will be executed in the browser of a user whenever one visits the affected module page.","severity":{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00933,"percentile":0.61139,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-01-15T06:26:46Z","modified":"2026-06-17T03:38:54Z","products":[{"vendor":"flatcore","product":"flatcore"}],"references":[{"url":"https://github.com/flatCore/flatCore-CMS","tags":["x_refsource_MISC","x_transferred","Product","Third Party Advisory"]},{"url":"https://sec-consult.com/vulnerability-lab/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"http://packetstormsecurity.com/files/160936/flatCore-CMS-XSS-File-Disclosure-SQL-Injection.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23836"},{"url":"https://github.com/advisories/GHSA-2843-wghw-w3qp"}],"sources":{"cve":[{"id":"CVE-2021-23836","description":"An issue was discovered in flatCore before 2.0.0 build 139. A stored XSS vulnerability was identified in the prefs_smtp_psw HTTP request body parameter for the acp interface. An admin user can inject malicious client-side script into the affected parameter without any form of input sanitization. The injected payload will be executed in the browser of a user whenever one visits the affected module page.","status":"published","published":"2021-01-15T06:26:46Z","modified":"2024-08-03T19:14:09.251Z","updated_at":"2026-11-02T14:33:00.819444Z"}],"euvd":[{"id":"EUVD-2021-10764","description":"An issue was discovered in flatCore before 2.0.0 build 139. A stored XSS vulnerability was identified in the prefs_smtp_psw HTTP request body parameter for the acp interface. An admin user can inject malicious client-side script into the affected parameter without any form of input sanitization. The injected payload will be executed in the browser of a user whenever one visits the affected module page.","status":"published","published":"2021-01-15T06:26:46Z","modified":"2024-08-03T19:14:09Z","updated_at":"2026-11-03T03:25:00.126172Z"}],"ghsa":[{"id":"GHSA-2843-wghw-w3qp","title":"An issue was discovered in flatCore before 2.0.0 build 139. A stored XSS vulnerability was...","description":"An issue was discovered in flatCore before 2.0.0 build 139. A stored XSS vulnerability was identified in the prefs_smtp_psw HTTP request body parameter for the acp interface. An admin user can inject malicious client-side script into the affected parameter without any form of input sanitization. The injected payload will be executed in the browser of a user whenever one visits the affected module page.","status":"published","published":"2022-05-24T17:39:23Z","modified":"2023-01-29T05:05:25Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:45:47.324105Z"}],"nvd":[{"id":"CVE-2021-23836","description":"An issue was discovered in flatCore before 2.0.0 build 139. A stored XSS vulnerability was identified in the prefs_smtp_psw HTTP request body parameter for the acp interface. An admin user can inject malicious client-side script into the affected parameter without any form of input sanitization. The injected payload will be executed in the browser of a user whenever one visits the affected module page.","status":"published","published":"2021-01-15T07:15:14.033Z","modified":"2026-06-17T03:38:54.09Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/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":"2026-11-02T14:06:49.284888Z"}]}}