{"id":"CVE-2020-27224","aliases":["EUVD-2021-0825","GHSA-gcm9-cc3r-c6vj"],"status":"published","title":"Cross-site Scripting (XSS) in Eclipse Theia","description":"In Eclipse Theia versions up to and including 1.2.0, the Markdown Preview (@theia/preview), can be exploited to execute arbitrary code.","severity":{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.02593,"percentile":0.85511,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2021-02-24T16:40:24Z","modified":"2026-10-20T10:54:19Z","fixes":[{"ecosystem":"npm","package":"@theia/preview","fixed_in":["1.2.0","1.3.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@theia/preview","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.0"}]}]},{"source":"osv","ecosystem":"npm","package":"@theia/preview","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.3.0"}]}]}],"products":[{"vendor":"eclipse","product":"theia"},{"vendor":"the eclipse foundation","product":"eclipse theia"}],"references":[{"url":"https://github.com/eclipse-theia/theia/issues/7954","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report","web"]},{"url":"https://omespino.com/write-up-google-bug-bounty-xss-to-cloud-shell-instance-takeover-rce-as-root-5000-usd/","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27224","tags":["advisory"]},{"url":"https://github.com/eclipse-theia/theia/pull/7971","tags":["web"]},{"url":"https://github.com/advisories/GHSA-gcm9-cc3r-c6vj"},{"url":"https://omespino.com/write-up-google-bug-bounty-xss-to-cloud-shell-instance-takeover-rce-as-root-5000-usd","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2020-27224","description":"In Eclipse Theia versions up to and including 1.2.0, the Markdown Preview (@theia/preview), can be exploited to execute arbitrary code.","status":"published","published":"2021-02-24T16:40:24Z","modified":"2024-08-04T16:11:36.023Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:35:53.552996Z"}],"euvd":[{"id":"EUVD-2021-0825","description":"In Eclipse Theia versions up to and including 1.2.0, the Markdown Preview (@theia/preview), can be exploited to execute arbitrary code.","status":"published","published":"2021-02-24T16:40:24Z","modified":"2024-08-04T16:11:36Z","updated_at":"2026-11-03T03:07:12.940476Z"}],"ghsa":[{"id":"GHSA-gcm9-cc3r-c6vj","title":"Cross-site Scripting (XSS) in Eclipse Theia","description":"In Eclipse Theia versions up to and including 1.2.0, the Markdown Preview (@theia/preview), can be exploited to execute arbitrary code.","status":"published","published":"2021-04-13T15:18:09Z","modified":"2023-02-01T05:05:12Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:36:32.918681Z"}],"nvd":[{"id":"CVE-2020-27224","description":"In Eclipse Theia versions up to and including 1.2.0, the Markdown Preview (@theia/preview), can be exploited to execute arbitrary code.","status":"published","published":"2021-02-24T17:15:15.5Z","modified":"2026-06-17T03:09:00.32Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":9.3,"vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:37.687844Z"}],"osv":[{"id":"CVE-2020-27224","description":"In Eclipse Theia versions up to and including 1.2.0, the Markdown Preview (@theia/preview), can be exploited to execute arbitrary code.","status":"published","published":"2021-02-24T17:15:15.5Z","modified":"2026-10-20T10:54:19.238442327Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:16.248747Z"},{"id":"GHSA-gcm9-cc3r-c6vj","title":"Cross-site Scripting (XSS) in Eclipse Theia","description":"In Eclipse Theia versions up to and including 1.2.0, the Markdown Preview (@theia/preview), can be exploited to execute arbitrary code.","status":"published","published":"2021-04-13T15:18:09Z","modified":"2023-11-08T04:03:21.439389Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:47.822182Z"}]}}