{"id":"CVE-2021-26835","aliases":["EUVD-2021-13619","GHSA-m4hh-q8q7-hhmv"],"status":"published","title":"No filtering of cross-site scripting (XSS) payloads in the markdown-editor in Zettlr 1.8.7 allows...","description":"No filtering of cross-site scripting (XSS) payloads in the markdown-editor in Zettlr 1.8.7 allows attackers to perform remote code execution via a crafted file.","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":0.01291,"percentile":0.70635,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-06-18T11:46:56Z","modified":"2026-10-20T10:54:34Z","products":[{"vendor":"zettlr","product":"zettlr"}],"references":[{"url":"https://github.com/Zettlr/Zettlr/issues/1716","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/Zettlr/Zettlr/releases/tag/v1.8.9","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26835"},{"url":"https://github.com/advisories/GHSA-m4hh-q8q7-hhmv"}],"sources":{"cve":[{"id":"CVE-2021-26835","description":"No filtering of cross-site scripting (XSS) payloads in the markdown-editor in Zettlr 1.8.7 allows attackers to perform remote code execution via a crafted file.","status":"published","published":"2021-06-18T11:46:56Z","modified":"2024-08-03T20:33:41.014Z","updated_at":"2026-11-02T14:32:57.033395Z"}],"euvd":[{"id":"EUVD-2021-13619","description":"No filtering of cross-site scripting (XSS) payloads in the markdown-editor in Zettlr 1.8.7 allows attackers to perform remote code execution via a crafted file.","status":"published","published":"2021-06-18T11:46:56Z","modified":"2024-08-03T20:33:41Z","updated_at":"2026-11-03T03:24:50.84326Z"}],"ghsa":[{"id":"GHSA-m4hh-q8q7-hhmv","title":"No filtering of cross-site scripting (XSS) payloads in the markdown-editor in Zettlr 1.8.7 allows...","description":"No filtering of cross-site scripting (XSS) payloads in the markdown-editor in Zettlr 1.8.7 allows attackers to perform remote code execution via a crafted file.","status":"published","published":"2022-05-24T19:05:39Z","modified":"2023-01-29T05:06:35Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:46:03.455343Z"}],"nvd":[{"id":"CVE-2021-26835","description":"No filtering of cross-site scripting (XSS) payloads in the markdown-editor in Zettlr 1.8.7 allows attackers to perform remote code execution via a crafted file.","status":"published","published":"2021-06-18T12:15:08.04Z","modified":"2026-06-17T03:43:50.89Z","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":"2026-11-02T14:06:54.892562Z"}],"osv":[{"id":"CVE-2021-26835","description":"No filtering of cross-site scripting (XSS) payloads in the markdown-editor in Zettlr 1.8.7 allows attackers to perform remote code execution via a crafted file.","status":"published","published":"2021-06-18T12:15:08.04Z","modified":"2026-10-20T10:54:34.753212117Z","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":"2026-11-02T15:44:18.778776Z"}]}}