CVE-2026-3429
mediumEPSS 0.003 · 24 %ileDEEUUSEPSS · scored 2026-10-17
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (8)
Products and version ranges known to be affected.
advisories (3)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-0560Keycloak: Schwachstelle ermöglicht Umgehen von SicherheitsvorkehrungenDeutsch2026-03-01csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Keycloak ausnutzen, um Sicherheitsvorkehrungen zu umgehen.
- GHSA-8g9r-9wjw-37j4Keycloak: Improper Access Control Leading to MFA Deletion and Account Takeover in Keycloak Account REST API2026-03-11ghsa · osvUS
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.
- BIT-keycloak-2026-3429Org.keycloak.services.resources.account: improper access control leading to mfa deletion and account takeover in keycloak account rest api2026-08-25vendor · osvUS
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.
also known as (5)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (11)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2026-3429cnnvd
- https://github.com/keycloak/keycloak/releasesPatchcnnvd
- https://vigilance.fr/vulnerability/Keycloak-read-write-access-via-Admin-REST-API-50335cnnvd
- https://access.redhat.com/errata/RHSA-2026:6477enisa_euvd
- https://access.redhat.com/errata/RHSA-2026:6478enisa_euvd
- https://access.redhat.com/security/cve/CVE-2026-3429enisa_euvd
- https://bugzilla.redhat.com/show_bug.cgi?id=2443771enisa_euvd
- https://access.redhat.com/errata/RHSA-2026:6477Vendor Advisorynvd
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