CVE-2026-1529
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
ProductOrg.keycloak:keycloak-services
PublishedFeb 9, 2026
First seenFeb 9, 2026
Weakness typeCWE-347CWE-347
How to fix
Update
- org.keycloak:keycloak-services26.5.3, 26.2.13, 26.4.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.keycloak:keycloak-servicesMaven | 26.5.0 ≤ v < 26.5.3, v < 26.2.13, 26.3.0 ≤ v < 26.4.9 | 26.5.3, 26.2.13, 26.4.9 |
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