CVE-2021-3827
ECP SAML binding bypasses authentication flows
8.1
HIGH
CVSS 3.1
EPSS 0.21%
Description
### Description 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.
How to fix CVE-2021-3827
To remediate CVE-2021-3827, upgrade the affected package to a fixed version below.
- —upgrade to 18.0.0 or later
Is CVE-2021-3827 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 18.0.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |