{"cve":"CVE-2020-4070","nvd":{"published":"2020-06-22T16:15:11.963","modified":"2026-06-17T03:19:31.040","status":"Modified","description":"In CSS Validator less than or equal to commit 54d68a1, there is a cross-site scripting vulnerability in handling URIs. A user would have to click on a specifically crafted validator link to trigger it. This has been patched in commit e5c09a9.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4},"cwes":["CWE-79"],"references":["https://github.com/w3c/css-validator/commit/e5c09a9119167d3064db786d5f00d730b584a53b","https://github.com/w3c/css-validator/security/advisories/GHSA-wf36-7w73-rh8c","https://github.com/w3c/css-validator/commit/e5c09a9119167d3064db786d5f00d730b584a53b","https://github.com/w3c/css-validator/security/advisories/GHSA-wf36-7w73-rh8c"],"products":["w3c:css_validator"],"source":"nvd","synced_at":"2026-10-19T21:05:42.039641217+00:00"},"epss":{"cve":"CVE-2020-4070","score":0.0055,"percentile":0.46041,"date":"2026-11-01"},"kev":null,"osv":[],"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."]}