{"id":"CVE-2021-32091","aliases":["GHSA-37m5-42qp-4qpr","PYSEC-2021-102"],"url":"https://o3.security/vulnerability/CVE-2021-32091","summary":"Cross-site scripting in LocalStack","details":"A Cross-site scripting (XSS) vulnerability exists in StackLift LocalStack 0.12.6.","published":"2021-05-07T05:15:08.247Z","modified":"2026-07-09T06:35:12.488333Z","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":0.00846,"percentile":0.54896,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"PyPI","name":"localstack","fixedVersion":null}],"fix":null,"references":[{"type":"EVIDENCE","url":"https://blog.sonarsource.com/hack-the-stack-with-localstack"},{"type":"EVIDENCE","url":"https://portswigger.net/daily-swig/localstack-zero-day-vulnerabilities-chained-to-achieve-remote-takeover-of-local-instances"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-32091"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-37m5-42qp-4qpr"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/localstack/PYSEC-2021-102.yaml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T06:35:12.488333Z"}}