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Description

A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an unauthenticated attacker to forge authorization codes. Successful exploitation can lead to the creation of admin-capable access tokens, resulting in privilege escalation.

PUBLISHED Reserved 2026-03-16 | Published 2026-04-02 | Updated 2026-04-07 | Assigner redhat




HIGH: 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem types

Improper Isolation or Compartmentalization

Product status

Default status
affected

26.2.15-1 (rpm) before *
unaffected

Default status
affected

26.2-18 (rpm) before *
unaffected

Default status
affected

26.2-18 (rpm) before *
unaffected

Default status
unaffected

Default status
affected

26.4.11-1 (rpm) before *
unaffected

Default status
affected

26.4-14 (rpm) before *
unaffected

Default status
affected

26.4-14 (rpm) before *
unaffected

Default status
unaffected

Timeline

2026-03-16:Reported to Red Hat.
2026-04-02:Made public.

Credits

Red Hat would like to thank chungkn (OneMount Group) for reporting this issue.

References

access.redhat.com/errata/RHSA-2026:6475 (RHSA-2026:6475) vendor-advisory

access.redhat.com/errata/RHSA-2026:6476 (RHSA-2026:6476) vendor-advisory

access.redhat.com/errata/RHSA-2026:6477 (RHSA-2026:6477) vendor-advisory

access.redhat.com/errata/RHSA-2026:6478 (RHSA-2026:6478) vendor-advisory

access.redhat.com/security/cve/CVE-2026-4282 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2448061 (RHBZ#2448061) issue-tracking

cve.org (CVE-2026-4282)

nvd.nist.gov (CVE-2026-4282)

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