CVE-2021-3856

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.

Published: Aug 26, 2022
Updated: May 9, 2024
CVE: CVE-2021-3856
GHSA: GHSA-3w4v-rvc4-2xpw
Severity: Low
Exploit:

CVSS v3:

Severity: Low
Score: 4.3
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CWEs:

CWE-22
CWE-552

OWASP TOP 10:

A5 - Broken Access Control

Affected Software
References

Software	From	Fixed in
redhat / keycloak	-	15.1.0
org.keycloak / keycloak-core	-	15.1.0

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

Vulnerability Database

CVE-2021-3856

Deep Security Visibility Without the Complexity