CVSS 3.1
6.8 mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:NCVE-2021-3827
Medium (6.8) in redhat. EPSS 1.1% chance of exploitation in the next 30 days. Fixed in org.keycloak:keycloak-saml-core 18.0.0.
A flaw was found in keycloak, where the default ECP binding flow allows other authentication flows to be bypassed. By exploiting this behavior, an attacker can bypass the MFA authentication by sending a SOAP request with an AuthnRequest and Authorization header with the user's credentials. The highest threat from this vulnerability is to confidentiality and integrity.
Severity
- EPSS
- 1.1% chance of exploitation in the next 30 days; higher than 65% of CVEs (scores of 2026-10-31)
- CWE
- CWE-287
- Published
- Modified
- Record from
- the NVD, synced
Affected
- redhat:keycloak
- redhat:openshift_container_platform
- redhat:single_sign-on
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-4pc7-vqv5-5r3v | Maven | org.keycloak:keycloak-saml-core | <18.0.0 | 18.0.0 |
References
- https://access.redhat.com/security/cve/CVE-2021-3827
- https://bugzilla.redhat.com/show_bug.cgi?id=2007512
- https://github.com/keycloak/keycloak/commit/44000caaf5051d7f218d1ad79573bd3d175cad0d
- https://github.com/keycloak/keycloak/security/advisories/GHSA-4pc7-vqv5-5r3v
- https://access.redhat.com/security/cve/CVE-2021-3827