{"id":"CVE-2021-3783","aliases":["GHSA-cpq8-x35g-m439"],"url":"https://o3.security/vulnerability/CVE-2021-3783","summary":"Cross-site Scripting in yourls","details":"yourls is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in arbitrary path handling.","published":"2021-09-15T12:15:16.207Z","modified":"2026-07-09T01:31:33.192430Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.00696,"percentile":0.51377,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"yourls/yourls","fixedVersion":null}],"fix":{"url":"https://github.com/yourls/yourls/commit/94f6bab91182142c96ff11f481585b445449efd4","label":"yourls/yourls@94f6bab"},"references":[{"type":"FIX","url":"https://github.com/yourls/yourls/commit/94f6bab91182142c96ff11f481585b445449efd4"},{"type":"FIX","url":"https://huntr.dev/bounties/b688e553-d0d9-4ddf-95a3-ff4b78004984"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3783"},{"type":"PACKAGE","url":"https://github.com/yourls/yourls"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T01:31:33.192430Z"}}