{"id":"CVE-2021-3830","aliases":["EUVD-2021-27077","GHSA-3xmg-w8wr-4536"],"status":"published","title":"Cross-site Scripting (XSS) - Stored in btcpayserver/btcpayserver","description":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","severity":{"version":"3.0","score":3.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0056,"percentile":0.46937,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-09-26T08:15:14Z","modified":"2026-10-20T10:54:51Z","products":[{"vendor":"btcpayserver","product":"btcpay_server"},{"vendor":"btcpayserver","product":"btcpayserver/btcpayserver"}],"references":[{"url":"https://github.com/btcpayserver/btcpayserver/commit/fc4e47cec608cc3dba24b19d0145ac69320b975e","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://huntr.dev/bounties/0fcdee5f-1f07-47ce-b650-ea8b4a7d35d8","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3830"},{"url":"https://github.com/advisories/GHSA-3xmg-w8wr-4536"}],"sources":{"cve":[{"id":"CVE-2021-3830","title":"Cross-site Scripting (XSS) - Stored in btcpayserver/btcpayserver","description":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-26T08:15:14Z","modified":"2024-08-03T17:09:09.611Z","cvss":[{"version":"3.0","score":3.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:33:03.671751Z"}],"euvd":[{"id":"EUVD-2021-27077","description":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-26T08:15:14Z","modified":"2024-08-03T17:09:09Z","cvss":[{"version":"3.0","score":3.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","level":"low"}],"updated_at":"2026-11-03T03:25:11.376657Z"}],"ghsa":[{"id":"GHSA-3xmg-w8wr-4536","title":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross...","description":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2022-05-24T19:15:44Z","modified":"2023-01-30T05:02:19Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:46:36.658869Z"}],"nvd":[{"id":"CVE-2021-3830","description":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-26T09:15:09.843Z","modified":"2026-06-17T04:05:51.24Z","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":"3.0","score":3.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","level":"low","assessor":"secondary"},{"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":"2026-11-02T14:06:58.933037Z"}],"osv":[{"id":"CVE-2021-3830","description":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-26T09:15:09.843Z","modified":"2026-10-20T10:54:51.437009979Z","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":"2026-11-02T15:44:20.843843Z"}]}}