{"cve":"CVE-2021-42567","nvd":{"published":"2021-12-07T22:15:06.907","modified":"2026-06-17T04:09:50.740","status":"Modified","description":"Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.","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://apereo.github.io/2021/10/18/restvuln/","https://github.com/apereo/cas/releases","https://apereo.github.io/2021/10/18/restvuln/","https://github.com/apereo/cas/releases"],"products":["apereo:central_authentication_service"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-42567","score":0.08191,"percentile":0.9487,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-gfhx-jjwq-63gv","url":"https://osv.dev/vulnerability/GHSA-gfhx-jjwq-63gv","summary":"Cross-site Scripting in Apereo CAS","modified":"2024-11-30T05:31:26.901182Z","packages":[{"ecosystem":"Maven","name":"org.apereo.cas:cas-server-core-web","purl":"pkg:maven/org.apereo.cas/cas-server-core-web","ranges":["<6.4.2"],"fixed":["6.4.2"]}]}],"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."]}