{"cve":"CVE-2021-39286","nvd":{"published":"2021-08-18T18:15:08.177","modified":"2026-06-17T04:03:28.253","status":"Modified","description":"Webrecorder pywb before 2.6.0 allows XSS because it does not ensure that Jinja2 templates are autoescaped.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://github.com/webrecorder/pywb/commit/f7bd84cdacdd665ff73ae8d09a202f60be2ebae9","https://github.com/webrecorder/pywb/compare/v-2.5.0...v-2.6.0","https://github.com/webrecorder/pywb/commit/f7bd84cdacdd665ff73ae8d09a202f60be2ebae9","https://github.com/webrecorder/pywb/compare/v-2.5.0...v-2.6.0"],"products":["webrecorder:pywb"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-39286","score":0.00699,"percentile":0.53166,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-947x-pv47-pp3q","url":"https://osv.dev/vulnerability/GHSA-947x-pv47-pp3q","summary":"Cross-site scripting in pywb","modified":"2024-10-25T21:03:32.751263Z","packages":[{"ecosystem":"PyPI","name":"pywb","purl":"pkg:pypi/pywb","ranges":["<2.6.0"],"fixed":["2.6.0"]}]},{"id":"PYSEC-2021-120","url":"https://osv.dev/vulnerability/PYSEC-2021-120","summary":"","modified":"2023-11-08T04:06:35.401095Z","packages":[{"ecosystem":"PyPI","name":"pywb","purl":"pkg:pypi/pywb","ranges":["<2.6.0"],"fixed":["2.6.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}