{"id":"CVE-2021-3866","aliases":["EUVD-2021-27101","GHSA-c9g2-65fq-w8q5"],"status":"published","title":"Cross-site Scripting (XSS) - Stored in zulip/zulip","description":"Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip more than and including 44f935695d452cc3fb16845a0c6af710438b153d and prior to 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6.","severity":{"version":"3.0","score":6.8,"vector":"CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0089,"percentile":0.59663,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2022-01-20T10:30:11Z","modified":"2026-10-24T10:50:25Z","products":[{"vendor":"zulip","product":"zulip"},{"vendor":"zulip","product":"zulip/zulip"}],"references":[{"url":"https://huntr.dev/bounties/5f48dac5-e112-4b23-bbbf-cc00ba83bcf2","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://github.com/zulip/zulip/commit/3eb2791c3e9695f7d37ffe84e0c2184fae665cb6","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://blog.zulip.com/2022/01/19/cve-2021-3866/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3866"},{"url":"https://github.com/advisories/GHSA-c9g2-65fq-w8q5"}],"sources":{"cve":[{"id":"CVE-2021-3866","title":"Cross-site Scripting (XSS) - Stored in zulip/zulip","description":"Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip more than and including 44f935695d452cc3fb16845a0c6af710438b153d and prior to 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6.","status":"published","published":"2022-01-20T10:30:11Z","modified":"2024-08-03T17:09:09.603Z","cvss":[{"version":"3.0","score":6.8,"vector":"CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-27101","description":"Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip more than and including 44f935695d452cc3fb16845a0c6af710438b153d and prior to 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6.","status":"published","published":"2022-01-20T10:30:11Z","modified":"2024-08-03T17:09:09Z","cvss":[{"version":"3.0","score":6.8,"vector":"CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:L","level":"medium"}],"updated_at":"2026-11-03T03:25:11.376657Z"}],"ghsa":[{"id":"GHSA-c9g2-65fq-w8q5","title":"Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip prior to main.","description":"Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip prior to main.","status":"published","published":"2022-01-21T00:00:49Z","modified":"2023-02-03T05:04:54Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:53:38.626767Z"}],"nvd":[{"id":"CVE-2021-3866","description":"Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip more than and including 44f935695d452cc3fb16845a0c6af710438b153d and prior to 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6.","status":"published","published":"2022-01-20T11:15:07.927Z","modified":"2026-06-17T04:05:55.267Z","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":6.8,"vector":"CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:L","level":"medium","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":"2026-11-02T14:07:03.821385Z"}],"osv":[{"id":"CVE-2021-3866","description":"Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip more than and including 44f935695d452cc3fb16845a0c6af710438b153d and prior to 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6.","status":"published","published":"2022-01-20T11:15:07.927Z","modified":"2026-10-24T10:50:25.102188613Z","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"}]}}