Keycloak affected by improper invitation token validation
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-1529US | — | Exploit | ||
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 (JW… | ||||
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references
External citations — patches, advisories, analysis.
- https://access.redhat.com/errata/RHSA-2026:2363WEB
- https://access.redhat.com/errata/RHSA-2026:2364WEB
- https://access.redhat.com/errata/RHSA-2026:2365WEB
- https://access.redhat.com/errata/RHSA-2026:2366WEB
- https://access.redhat.com/security/cve/CVE-2026-1529WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2433783WEB
- https://github.com/keycloak/keycloakPACKAGE
- https://github.com/keycloak/keycloak/commit/82cd7941d1dd28fa14a67a6e6b912301f1a5e1a1WEB
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