CVE-2026-3429 Keycloak: Improper Access Control Leading to MFA Deletion and Account Takeover in Keycloak Account REST API
An attacker with a victim's password can bypass MFA checks to delete existing credentials and register their own, leading to full account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-3429?
CVE-2026-3429 is a medium-severity missing authorization vulnerability in Redhat Build of Keycloak, published on 11 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was identified in the Account REST API of Keycloak that allows a user authenticated at a lower security level to perform sensitive actions intended only for higher-assurance sessions. Specifically, an attacker who has already obtained a victim’s password can delete the victim’s registered MFA/OTP credential without first proving possession of that factor. The attacker can then register their own MFA device, effectively taking full control of the account. This weakness undermines the intended protection provided by multi-factor authentication.
Weakness: CWE-284
Which versions are affected by CVE-2026-3429?
3 open source packages ship an affected version, including org.keycloak:keycloak-services and keycloak. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-services Maven | All versions to 26.5.6 | None |
org.keycloak:keycloak-services Maven | All versions to 26.5.6 | None |
keycloak Bitnami | From 26.4.0 | 26.4.11 |
Products include Redhat Build of Keycloak.
How do I fix CVE-2026-3429?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-3429 being exploited?
There is no known exploitation of CVE-2026-3429 in the wild and no public exploit code.
Other vulnerabilities in Redhat Build of Keycloak
- CVE-2026-15572 Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
- CVE-2026-3047 Keycloak SAML Broken has Authentication Bypass by Primary Weakness
- CVE-2026-15573 Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
- CVE-2026-16102 Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers
- CVE-2026-1609 Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
Sources
Also known as BIT-keycloak-2026-3429, ECHO-a685-7f88-c69b, GHSA-8g9r-9wjw-37j4, MINI-8w2p-rqvv-j7xm, MINI-gg69-g8c9-37mv.