{"id":"CVE-2021-41088","aliases":["GHSA-fpv6-f8jw-rc3r","GO-2022-0937"],"url":"https://o3.security/vulnerability/CVE-2021-41088","summary":"Elvish vulnerable to remote code execution via the web UI backend","details":"### Impact\n\nElvish's backend for the experimental web UI (started by `elvish -web`) hosts an endpoint that allows executing the code sent from the web UI.\n\nThe backend does not check the origin of requests correctly. As a result, if the user has the web UI backend open and visits a compromised or malicious website, the website can send arbitrary code to the endpoint in localhost.\n\n### Patches\n\nAll Elvish releases since 0.14.0 no longer include the experimental web UI, although it is still possible for the user to build a version from source that includes it.\n\nThe issue can be patched for previous versions by removing the web UI (found in web, pkg/web or pkg/prog/web, depending on the exact version).\n\n### Workarounds\n\nDo not use the experimental web UI.\n\n### For more information\n\nIf you have any questions or comments about this advisory, please email xiaqqaix@gmail.com.","published":"2021-09-23T20:15:07.720Z","modified":"2026-07-09T10:52:46.283039Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":{"score":0.00537,"percentile":0.43975,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/elves/elvish","fixedVersion":"0.14.0"}],"fix":{"url":"https://github.com/elves/elvish/commit/ccc2750037bbbfafe9c1b7a78eadd3bd16e81fe5","label":"elves/elvish@ccc2750"},"references":[{"type":"ADVISORY","url":"https://github.com/elves/elvish/security/advisories/GHSA-fpv6-f8jw-rc3r"},{"type":"FIX","url":"https://github.com/elves/elvish/commit/ccc2750037bbbfafe9c1b7a78eadd3bd16e81fe5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41088"},{"type":"PACKAGE","url":"https://github.com/elves/elvish"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T10:52:46.283039Z"}}