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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.

PUBLISHED Reserved 2026-01-28 | Published 2026-02-09 | Updated 2026-02-16 | Assigner redhat




HIGH: 8.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Problem types

Improper Verification of Cryptographic Signature

Product status

Default status
affected

26.2.13-1 (rpm) before *
unaffected

Default status
affected

26.2-15 (rpm) before *
unaffected

Default status
affected

26.2-15 (rpm) before *
unaffected

Default status
unaffected

Default status
affected

26.4.9-1 (rpm) before *
unaffected

Default status
affected

26.4-11 (rpm) before *
unaffected

Default status
affected

26.4-10 (rpm) before *
unaffected

Default status
unaffected

Timeline

2026-01-28:Reported to Red Hat.
2026-02-09:Made public.

Credits

Red Hat would like to thank Joy Gilbert (gwthr) and Reynaldo Immanuel for reporting this issue.

References

access.redhat.com/errata/RHSA-2026:2363 (RHSA-2026:2363) vendor-advisory

access.redhat.com/errata/RHSA-2026:2364 (RHSA-2026:2364) vendor-advisory

access.redhat.com/errata/RHSA-2026:2365 (RHSA-2026:2365) vendor-advisory

access.redhat.com/errata/RHSA-2026:2366 (RHSA-2026:2366) vendor-advisory

access.redhat.com/security/cve/CVE-2026-1529 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2433783 (RHBZ#2433783) issue-tracking

cve.org (CVE-2026-1529)

nvd.nist.gov (CVE-2026-1529)

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