high8.1
CVE-2026-1529
Keycloak affected by improper invitation token validation
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | org.keycloak:keycloak-services | >= 26.5.0, < 26.5.3 | 26.5.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://access.redhat.com/errata/RHSA-2026:2363
- https://access.redhat.com/errata/RHSA-2026:2364
- https://access.redhat.com/errata/RHSA-2026:2365
- https://access.redhat.com/errata/RHSA-2026:2366
- https://access.redhat.com/security/cve/CVE-2026-1529
- https://bugzilla.redhat.com/show_bug.cgi?id=2433783
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1529.json
- https://github.com/advisories/GHSA-hcvw-475w-8g7p
- https://nvd.nist.gov/vuln/detail/CVE-2026-1529
- https://github.com/keycloak/keycloak/issues/46145
- https://github.com/keycloak/keycloak/pull/46155
- https://github.com/keycloak/keycloak/commit/8fc9a98026106a326f4faa98d4c9a48341ace2d7
- https://github.com/keycloak/keycloak/commit/82cd7941d1dd28fa14a67a6e6b912301f1a5e1a1
- https://github.com/keycloak/keycloak/commit/b2519756487b519f95c07aa8b10afe003e492119