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PatchSiren cyber security CVE debrief

CVE-2026-1529 Red Hat CVE debrief

CVE-2026-1529 is a high-severity vulnerability in Keycloak that allows attackers to self-register into unauthorized organizations, leading to unauthorized access. 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 enables the attacker to successfully self-register. The vulnerability has a CVSS score of 8.1 and is considered high severity. The CVE was published on February 9, 2026, and last modified on June 30, 2026.

Vendor
Red Hat
Product
Red Hat build of Keycloak 26.2
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-02-09
Original CVE updated
2026-07-15
Advisory published
2026-02-09
Advisory updated
2026-07-15

Who should care

Organizations using Keycloak for authentication and authorization should be aware of this vulnerability and take immediate action to mitigate it. This vulnerability could allow attackers to gain unauthorized access to sensitive systems and data. Keycloak administrators should review their systems for potential exposure and apply patches or workarounds as needed.

Technical summary

The vulnerability exists in Keycloak's invitation token system, where an attacker can modify the organization ID and target email in a legitimate invitation token's JWT payload. This allows the attacker to self-register into an unauthorized organization, gaining unauthorized access. The vulnerability is caused by a lack of cryptographic signature verification on the JWT payload. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Defensive priority

High priority should be given to patching or mitigating this vulnerability, as it could allow attackers to gain unauthorized access to sensitive systems and data. Keycloak administrators should review their systems for potential exposure and apply patches or workarounds as needed.

Recommended defensive actions

  • Apply patches or updates provided by the vendor to fix the vulnerability.
  • Review Keycloak systems for potential exposure and apply workarounds if patches are not available.
  • Monitor systems for suspicious activity related to invitation tokens and self-registration.
  • Implement additional security controls, such as multi-factor authentication, to reduce the risk of unauthorized access.
  • Conduct a thorough review of Keycloak configurations and settings to ensure they are secure and up-to-date.

Evidence notes

The CVE-2026-1529 vulnerability was published on February 9, 2026, and last modified on June 30, 2026. The vulnerability has a CVSS score of 8.1 and is considered high severity. The CVE record and NVD detail pages provide additional information about the vulnerability, including its CVSS vector and potential impacts.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-1529 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-1529

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-1529 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-1529

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.