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Description

A flaw was identified in the Account REST API of Keycloak that allows a user authenticated at a lower security level to perform sensitive actions intended only for higher-assurance sessions. Specifically, an attacker who has already obtained a victim’s password can delete the victim’s registered MFA/OTP credential without first proving possession of that factor. The attacker can then register their own MFA device, effectively taking full control of the account. This weakness undermines the intended protection provided by multi-factor authentication.

PUBLISHED Reserved 2026-03-02 | Published 2026-03-11 | Updated 2026-03-12 | Assigner redhat




MEDIUM: 4.2CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Problem types

Improper Access Control

Product status

Default status
unaffected

Default status
affected

Default status
unaffected

Default status
unaffected

Default status
unaffected

Default status
unaffected

Timeline

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

Credits

Red Hat would like to thank hamayanhamayan for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-3429 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2443771 (RHBZ#2443771) issue-tracking

cve.org (CVE-2026-3429)

nvd.nist.gov (CVE-2026-3429)

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