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Description

A flaw was found in Keycloak. This authentication vulnerability allows a remote attacker to replay `ExecuteActionsActionToken` tokens within Keycloak's WebAuthn (Web Authentication) flow. By intercepting an execute-actions email link, an attacker can register their own authenticator to a victim's account. This leads to unauthorized enrollment of a hardware-backed credential, enabling persistent account takeover.

PUBLISHED Reserved 2026-04-06 | Published 2026-05-19 | Updated 2026-05-20 | Assigner redhat




MEDIUM: 6.8CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Product status

Default status
affected

26.4.12-1 (rpm) before *
unaffected

Default status
affected

26.4-17 (rpm) before *
unaffected

Default status
affected

26.4-17 (rpm) before *
unaffected

Default status
unaffected

Timeline

2026-04-06:Reported to Red Hat.
2026-05-19:Made public.

References

access.redhat.com/errata/RHSA-2026:19596 (RHSA-2026:19596) vendor-advisory

access.redhat.com/errata/RHSA-2026:19597 (RHSA-2026:19597) vendor-advisory

access.redhat.com/security/cve/CVE-2026-37982 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2455329 (RHBZ#2455329) issue-tracking

cve.org (CVE-2026-37982)

nvd.nist.gov (CVE-2026-37982)

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