CVE-2026-4630 Keycloak: keycloak: unauthorized resource access and data modification via insecure direct object reference
Authenticated clients can bypass authorization checks to access, modify, or delete resources belonging to other Resource Servers within the same realm.
- 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-2026-4630?
CVE-2026-4630 is a medium-severity missing authorization vulnerability in Redhat Build of Keycloak, published on 19 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in Keycloak. An authenticated client could exploit an Insecure Direct Object Reference (IDOR) vulnerability in the Authorization Services Protection API endpoint. By knowing or obtaining a resource's unique identifier (UUID) belonging to another Resource Server within the same realm, the client could bypass authorization checks. This allows the client to perform unauthorized GET, PUT, and DELETE operations on resources, leading to information disclosure and potential unauthorized modification or deletion of data.
Weakness: CWE-639
Which versions are affected by CVE-2026-4630?
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 | 26.6.2 |
org.keycloak:keycloak-services Maven | All versions | 26.6.2 |
keycloak Bitnami | From 26.4.0 | 26.4.12 |
Products include Redhat Build of Keycloak.
How do I fix CVE-2026-4630?
Upgrade org.keycloak:keycloak-services to 26.6.2 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-4630 being exploited?
There is no known exploitation of CVE-2026-4630 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-2026-4630, ECHO-7e6c-6fdf-b723, GHSA-c739-f6xw-6pv2, MINI-34vq-4f25-c965, MINI-hwqm-8g8x-ch6h.