CVE-2026-1529 PoC — Org.keycloak.services.resources.organizations: keycloak: unauthorized organization registration via improper invitation

Source

https://github.com/ninjazan420/CVE-2026-1529-PoC-keycloak-unauthorized-registration-via-improper-invitation-token-validation

Associated Vulnerability

Title:Org.keycloak.services.resources.organizations: keycloak: unauthorized organization registration via improper invitation token validation (CVE-2026-1529)
Description: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.

Description

CVE-2026-1529 (PoC) is a critical vulnerability in Keycloak that allows unauthorized organization registration through improper invitation token validation. This exploit tool demonstrates the vulnerability by manipulating JWT tokens to register users in unauthorized organizations.

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