CVE-2026-1529
Keycloak affected by improper invitation token validation
8.1
HIGH
CVSS 3.1
EPSS 0.01%
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.
How to fix CVE-2026-1529
To remediate CVE-2026-1529, upgrade the affected package to a fixed version below.
- —upgrade to 26.5.3 or later
Is CVE-2026-1529 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 26.5.0, < 26.5.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |