Org.keycloak.services.resources.organizations: keycloak: unauthorized organization registration via improper invitation token validation
Summary
| CVE | CVE-2026-1529 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-02-09 20:15:55 UTC |
| Updated | 2026-07-15 02:18:16 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 8.1 HIGH from ADP
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS: 0.004530000 probability, percentile 0.365830000 (date 2026-07-18)
Problem Types: CWE-347 | CWE-347 Improper Verification of Cryptographic Signature
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | CVSS | 8.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | [email protected] | Secondary | 8.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 8.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | CNA | CVSS | 8.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2.13-1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2-15 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2-15 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.2.13 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4.9-1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-11 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-10 * rpm | Not specified |
| CNA | Red Hat | Red Hat Build Of Keycloak 26.4.9 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2.13-1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2-15 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.2 | unaffected 26.2-15 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.2.13 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4.9-1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-11 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4 | unaffected 26.4-10 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak 26.4.9 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:2365 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:2363 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1529.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:2364 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:2366 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-1529 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Red Hat would like to thank Joy Gilbert (gwthr) and Reynaldo Immanuel for reporting this issue. (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-01-28T12:29:47.086Z | Reported to Red Hat. |
| CNA | 2026-02-09T18:21:00.000Z | Made public. |
| ADP | 2026-01-28T12:29:47.086Z | Reported to Red Hat. |
| ADP | 2026-02-09T18:21:00.000Z | Made public. |
Solutions
ADP: RHSA-2026:2364: Red Hat build of Keycloak 26.2
ADP: RHSA-2026:2366: Red Hat build of Keycloak 26.4
ADP: RHSA-2026:2363: Red Hat build of Keycloak 26.2.13
ADP: RHSA-2026:2365: Red Hat build of Keycloak 26.4.9
Workarounds
CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.