{"cve":"CVE-2021-3856","nvd":{"published":"2022-08-26T16:15:09.570","modified":"2026-06-17T04:05:54.257","status":"Modified","description":"ClassLoaderTheme and ClasspathThemeResourceProviderFactory allows reading any file available as a resource to the classloader. By sending requests for theme resources with a relative path from an external HTTP client, the client will receive the content of random files if available.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3},"cwes":["CWE-22","CWE-552"],"references":["https://access.redhat.com/security/cve/CVE-2021-3856","https://bugzilla.redhat.com/show_bug.cgi?id=2010164","https://github.com/keycloak/keycloak/commit/73f0474008e1bebd0733e62a22aceda9e5de6743","https://github.com/keycloak/keycloak/pull/8588","https://issues.redhat.com/browse/KEYCLOAK-19422"],"products":["redhat:keycloak"],"source":"nvd","synced_at":"2026-10-19T21:35:14.992143698+00:00"},"epss":{"cve":"CVE-2021-3856","score":0.01158,"percentile":0.67084,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-3w4v-rvc4-2xpw","url":"https://osv.dev/vulnerability/GHSA-3w4v-rvc4-2xpw","summary":"Keycloak has Files or Directories Accessible to External Parties","modified":"2024-02-16T08:12:22.678977Z","packages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-core","purl":"pkg:maven/org.keycloak/keycloak-core","ranges":["<15.1.0"],"fixed":["15.1.0"]}]}],"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."]}