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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | keycloak | Fixed in v18.0.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Single Sign On 7 | rh-sso7-keycloak +1 | 15.0.4-1.redhat_00001.1.el7sso | RHSA-2022:0152, RHSA-2022:0151 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.keycloak:keycloak-saml-core | < 18.0.0 | 18.0.0 | GHSA-4pc7-vqv5-5r3v |
Advisories 3
- RHSA-2022:0152 Red Hat Security Advisory: Red Hat Single Sign-On 7.5.1 security update on RHEL 8 Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2022:0151 Red Hat Security Advisory: Red Hat Single Sign-On 7.5.1 security update on RHEL 7 Red Hat Security Advisories (RHSA) · Oct 13, 2026
- WID-SEC-2024-0794 Dell ECS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026