{"id":"CVE-2021-34435","details":"In Eclipse Theia 0.3.9 to 1.8.1, the \"mini-browser\" extension allows a user to preview HTML files in an iframe inside the IDE. But with the way it is made it is possible for a previewed HTML file to trigger an RCE. This exploit only happens if a user previews a malicious file..","aliases":["GHSA-v9w2-v7j9-rjpr"],"modified":"2026-03-14T08:43:13.567216Z","published":"2021-09-01T18:15:09.107Z","references":[{"type":"FIX","url":"https://bugs.eclipse.org/bugs/show_bug.cgi?id=568018"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/eclipse-theia/theia","events":[{"introduced":"7caa4c877661849f4e460055a2ca1695a2593b23"},{"last_affected":"65edb153bd37f322a45c6c928d757e4090ba3265"}],"database_specific":{"versions":[{"introduced":"0.3.9"},{"last_affected":"1.8.1"}]}}],"versions":["v0.10.0","v0.11.0","v0.12.0","v0.13.0","v0.14.0","v0.15.0","v0.16.0","v0.3.10","v0.3.11","v0.3.12","v0.3.13","v0.3.14","v0.3.15","v0.3.16","v0.3.17","v0.3.18","v0.3.19","v0.3.9","v0.4.0","v0.5.0","v0.6.0","v0.7.0","v0.8.0","v0.9.0","v1.0.0","v1.1.0","v1.2.0","v1.3.0","v1.4.0","v1.5.0","v1.6.0","v1.7.0","v1.8.0","v1.8.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-34435.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}