{"id":"CVE-2021-23384","aliases":[],"url":"https://o3.security/vulnerability/CVE-2021-23384","summary":"Open Redirect in koa-remove-trailing-slashes","details":"The package koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as `https://example.com//attacker.example/`). The vulnerable code is in `index.js::removeTrailingSlashes()`, as the web server uses relative URLs instead of absolute URLs.","published":"2022-02-10T23:47:27Z","modified":"2026-03-13T21:56:59.448210Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"},"epss":{"score":0.00835,"percentile":0.54576,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"koa-remove-trailing-slashes","fixedVersion":"2.0.2"}],"fix":{"url":"https://github.com/vgno/koa-remove-trailing-slashes/commit/e7ce4000e9fe4d957332df1056640a22ebea28ee","label":"vgno/koa-remove-trailing-slashes@e7ce400"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23384"},{"type":"WEB","url":"https://github.com/vgno/koa-remove-trailing-slashes/commit/e7ce4000e9fe4d957332df1056640a22ebea28ee"},{"type":"PACKAGE","url":"https://github.com/vgno/koa-remove-trailing-slashes"},{"type":"WEB","url":"https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js#L31"},{"type":"WEB","url":"https://snyk.io/vuln/SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-03-13T21:56:59.448210Z"}}