---
id: CVE-2026-1529
title: A flaw was found in Keycloak
summary: >-
  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
  verifica…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-347
  - CWE-347
published: '2026-02-09'
updated: '2026-06-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-1529'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:2363'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:2364'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:2365'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:2366'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-1529'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2433783'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:2363'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:2364'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:2365'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:2366'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-1529'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2433783'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1529.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
  - exploit-available
epss: 0.00461
epssPercentile: 0.37252
ingestedAt: '2026-07-03T18:53:52.186Z'
exploits:
  github: 4
  githubRepos:
    - >-
      https://github.com/ninjazan420/CVE-2026-1529-PoC-keycloak-unauthorized-registration-via-improper-invitation-token-validation
    - 'https://github.com/0x240x23elu/CVE-2026-1529'
    - >-
      https://github.com/ackemed/CVE-2026-1529-PoC-keycloak-unauthorized-registration-via-improper-invitation-token-validation
  checkedAt: '2026-09-25T08:20:50.582Z'
exploitAvailable: true
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.