CVE-2026-1529

The record

A flaw was found in Keycloak. An attacker can exploit this vulnerability by modifying the organization ID and target email within a legitimate invitation token's JSON Web Token (JWT) payload. This lack of cryptographic signature verification allows the attacker to successfully self-register into an unauthorized organization, leading to unauthorized access.

Affected packages

Related vulnerabilities

• GHSA-hcvw-475w-8g7p Keycloak affected by improper invitation token validation Same vulnerability
• GHSA-7g5x-9c4v-4w5r Keycloak REST Services has a WebAuthn Attestation Statement Verification Bypass Also affects org.keycloak:keycloak-services
• CVE-2025-12150 A flaw was found in Keycloak’s WebAuthn registration component. Also affects org.keycloak:keycloak-services
• GHSA-fjf4-6f34-w64q Keycloak: Missing Check on Disabled Client for Docker Registry Protocol Also affects org.keycloak:keycloak-services
• CVE-2026-2733 A flaw was identified in the Docker v2 authentication endpoint of Keycloak, where tokens… Also affects org.keycloak:keycloak-services
• GHSA-37gf-gmxv-74wv Keycloak fails to verify if an Identity Provider (IdP) is enabled before issuing tokens Also affects org.keycloak:keycloak-services
• GHSA-fm6w-rrp3-2x4w Keycloak Affected by Broken Access Control Vulnerability in the… Also affects org.keycloak:keycloak-services
• CVE-2026-1486 A flaw was found in Keycloak. Also affects org.keycloak:keycloak-services