{"id":"CVE-2021-34436","aliases":["EUVD-2021-21091","GHSA-8gpx-73gc-wq7c"],"status":"published","title":"In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote...","description":"In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote code execution (and XXE) via the theia-xml-extension. This extension uses lsp4xml (recently renamed to LemMinX) in order to provide language support for XML. This is installed by default.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.02223,"percentile":0.82948,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-22","CWE-611"],"published":"2021-09-02T20:55:10Z","modified":"2026-10-24T10:31:01Z","products":[{"vendor":"eclipse","product":"theia"},{"vendor":"the eclipse foundation","product":"eclipse theia"}],"references":[{"url":"https://bugs.eclipse.org/bugs/show_bug.cgi?id=563174","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34436"},{"url":"https://github.com/advisories/GHSA-8gpx-73gc-wq7c"}],"sources":{"cve":[{"id":"CVE-2021-34436","description":"In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote code execution (and XXE) via the theia-xml-extension. This extension uses lsp4xml (recently renamed to LemMinX) in order to provide language support for XML. This is installed by default.","status":"published","published":"2021-09-02T20:55:10Z","modified":"2024-08-04T00:12:50.189Z","cwes":["CWE-611","CWE-22"],"updated_at":"2026-11-02T14:33:11.244759Z"}],"euvd":[{"id":"EUVD-2021-21091","description":"In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote code execution (and XXE) via the theia-xml-extension. This extension uses lsp4xml (recently renamed to LemMinX) in order to provide language support for XML. This is installed by default.","status":"published","published":"2021-09-02T20:55:10Z","modified":"2024-08-04T00:12:50Z","updated_at":"2026-11-03T03:24:32.445199Z"}],"ghsa":[{"id":"GHSA-8gpx-73gc-wq7c","title":"In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote...","description":"In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote code execution (and XXE) via the theia-xml-extension. This extension uses lsp4xml (recently renamed to LemMinX) in order to provide language support for XML. This is installed by default.","status":"published","published":"2022-05-24T22:01:46Z","modified":"2023-01-30T05:04:59Z","cwes":["CWE-22","CWE-611"],"updated_at":"2026-11-02T14:47:10.094761Z"}],"nvd":[{"id":"CVE-2021-34436","description":"In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote code execution (and XXE) via the theia-xml-extension. This extension uses lsp4xml (recently renamed to LemMinX) in order to provide language support for XML. This is installed by default.","status":"published","published":"2021-09-02T21:15:07.977Z","modified":"2026-06-17T03:55:51.837Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-22","CWE-611"],"updated_at":"2026-11-02T14:06:58.05696Z"}],"osv":[{"id":"CVE-2021-34436","description":"In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote code execution (and XXE) via the theia-xml-extension. This extension uses lsp4xml (recently renamed to LemMinX) in order to provide language support for XML. This is installed by default.","status":"published","published":"2021-09-02T21:15:07.977Z","modified":"2026-10-24T10:31:01.432902338Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:20.13324Z"}]}}