{"id":"CVE-2021-20727","aliases":["EUVD-2021-8141","GHSA-vwf2-95mj-6g95"],"status":"published","title":"Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute...","description":"Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute an arbitrary script by loading a file or code snippet containing an invalid iframe into Zettlr.","severity":{"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","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01036,"percentile":0.64332,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-05-27T08:05:14Z","modified":"2026-10-20T10:53:53Z","products":[{"vendor":"hendrik erz","product":"zettlr"},{"vendor":"zettlr","product":"zettlr"}],"references":[{"url":"https://www.zettlr.com/","tags":["x_refsource_MISC","x_transferred","Product","web"]},{"url":"https://github.com/Zettlr/Zettlr","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://jvn.jp/en/jp/JVN98239374/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20727"},{"url":"https://github.com/advisories/GHSA-vwf2-95mj-6g95"}],"sources":{"cve":[{"id":"CVE-2021-20727","description":"Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute an arbitrary script by loading a file or code snippet containing an invalid iframe into Zettlr.","status":"published","published":"2021-05-27T08:05:14Z","modified":"2024-08-03T17:53:21.783Z","updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-8141","description":"Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute an arbitrary script by loading a file or code snippet containing an invalid iframe into Zettlr.","status":"published","published":"2021-05-27T08:05:14Z","modified":"2024-08-03T17:53:21Z","updated_at":"2026-11-03T03:25:08.33351Z"}],"ghsa":[{"id":"GHSA-vwf2-95mj-6g95","title":"Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute...","description":"Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute an arbitrary script by loading a file or code snippet containing an invalid iframe into Zettlr.","status":"published","published":"2022-05-24T19:03:31Z","modified":"2023-01-29T05:06:47Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:46:05.929333Z"}],"nvd":[{"id":"CVE-2021-20727","description":"Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute an arbitrary script by loading a file or code snippet containing an invalid iframe into Zettlr.","status":"published","published":"2021-05-27T09:15:07.533Z","modified":"2026-06-17T03:34:19.747Z","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":"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":"2026-11-02T14:06:53.987491Z"}],"osv":[{"id":"CVE-2021-20727","description":"Cross-site scripting vulnerability in Zettlr from 0.20.0 to 1.8.8 allows an attacker to execute an arbitrary script by loading a file or code snippet containing an invalid iframe into Zettlr.","status":"published","published":"2021-05-27T09:15:07.533Z","modified":"2026-10-20T10:53:53.385874454Z","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":"2026-11-02T15:44:18.004149Z"}]}}