CVE-2026-1529
Org.keycloak.services.resources.organizations: keycloak: unauthorized organization registration via improper invitation token validation
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.
INFO
Published Date :
Feb. 9, 2026, 8:15 p.m.
Last Modified :
Feb. 10, 2026, 2:15 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Ensure proper cryptographic signature verification for invitation tokens.
- Update Keycloak to the latest patched version.
- Review and validate all invitation token generation processes.
- Implement strict access controls for organization registration.
Public PoC/Exploit Available at Github
CVE-2026-1529 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-1529.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-1529 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-1529
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Keycloak: Unauthorized organization registration via improper invitation token validation
Python
CVE-2026-1529 (PoC) is a critical vulnerability in Keycloak that allows unauthorized organization registration through improper invitation token validation. This exploit tool demonstrates the vulnerability by manipulating JWT tokens to register users in unauthorized organizations.
concept cve keycloak of poc proof proofofconcept keycloak-poc cve-2026-1529
Python
Lobsters
Shell JavaScript HTML
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-1529 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-1529 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Feb. 10, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:2363 Added Reference https://access.redhat.com/errata/RHSA-2026:2365 Added Reference https://access.redhat.com/errata/RHSA-2026:2366 -
CVE Modified by [email protected]
Feb. 09, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:2364 -
New CVE Received by [email protected]
Feb. 09, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-347 Added Reference https://access.redhat.com/security/cve/CVE-2026-1529 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2433783