{"id":"CVE-2021-3646","aliases":["EUVD-2021-26943","GHSA-p4ww-48c6-98q5"],"status":"published","title":"Cross-site Scripting (XSS) - Reflected in btcpayserver/btcpayserver","description":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","severity":{"version":"3.0","score":4.9,"vector":"CVSS:3.0/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0077,"percentile":0.56127,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-09-10T18:02:50Z","modified":"2026-10-20T10:54:47Z","products":[{"vendor":"btcpayserver","product":"btcpay_server"},{"vendor":"btcpayserver","product":"btcpayserver/btcpayserver"}],"references":[{"url":"https://huntr.dev/bounties/32e30ecf-31fa-45f6-8552-47250ef0e613","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://github.com/btcpayserver/btcpayserver/commit/fc4e47cec608cc3dba24b19d0145ac69320b975e","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3646"},{"url":"https://github.com/advisories/GHSA-p4ww-48c6-98q5"}],"sources":{"cve":[{"id":"CVE-2021-3646","title":"Cross-site Scripting (XSS) - Reflected in btcpayserver/btcpayserver","description":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-10T18:02:50Z","modified":"2024-08-03T17:01:07.963Z","cvss":[{"version":"3.0","score":4.9,"vector":"CVSS:3.0/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-26943","description":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-10T18:02:50Z","modified":"2024-08-03T17:01:07Z","cvss":[{"version":"3.0","score":4.9,"vector":"CVSS:3.0/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-03T03:25:12.535968Z"}],"ghsa":[{"id":"GHSA-p4ww-48c6-98q5","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":"2022-05-24T19:14:08Z","modified":"2023-01-30T05:02:09Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:46:34.725436Z"}],"nvd":[{"id":"CVE-2021-3646","description":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-10T18:15:22.527Z","modified":"2026-06-17T04:05:30.083Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"3.0","score":4.9,"vector":"CVSS:3.0/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:58.502206Z"}],"osv":[{"id":"CVE-2021-3646","description":"btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","status":"published","published":"2021-09-10T18:15:22.527Z","modified":"2026-10-20T10:54:47.865344742Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:20.434873Z"}]}}