CVE-2026-3429
published 2026-03-11CVE-2026-3429: 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…
PriorityP426medium4.2CVSS 3.1
AVNACHPRLUINSUCLILAN
EPSS
0.33%
24.7th percentile
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.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| redhat | build_of_keycloak | >= 26.4 < 26.4.11 | 26.4.11 |
CVSS provenance
nvdv3.14.2MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
vendor_redhat4.2MEDIUM
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Red Hat
org.keycloak.services.resources.account: Improper Access Control Leading to MFA Deletion and Account Takeover in Keycloak Account REST API
vendor_redhat·2026-03-02·CVSS 4.2
CVE-2026-3429 [MEDIUM] CWE-284 org.keycloak.services.resources.account: Improper Access Control Leading to MFA Deletion and Account Takeover in Keycloak Account REST API
org.keycloak.services.resources.account: Improper Access Control Leading to MFA Deletion and Account Takeover in Keycloak Account REST API
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.
A flaw was identified in the Account REST API of Keycloak that allows a user authenticated at a lower s
VulDB
Red Hat Keycloak Account REST API access control (Nessus ID 305939)
vuldb·2026-04-11·CVSS 4.2
CVE-2026-3429 [MEDIUM] Red Hat Keycloak Account REST API access control (Nessus ID 305939)
A vulnerability has been found in Red Hat Keycloak and classified as critical. Impacted is an unknown function of the component Account REST API. The manipulation leads to improper access controls.
This vulnerability is referenced as CVE-2026-3429. Remote exploitation of the attack is possible. No exploit is available.
OSV
Keycloak: Improper Access Control Leading to MFA Deletion and Account Takeover in Keycloak Account REST API
osv·2026-03-11
CVE-2026-3429 [MEDIUM] Keycloak: Improper Access Control Leading to MFA Deletion and Account Takeover in Keycloak Account REST API
Keycloak: Improper Access Control Leading to MFA Deletion and Account Takeover in Keycloak Account REST API
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.
GHSA
Keycloak: Improper Access Control Leading to MFA Deletion and Account Takeover in Keycloak Account REST API
ghsa·2026-03-11
CVE-2026-3429 [MEDIUM] CWE-284 Keycloak: Improper Access Control Leading to MFA Deletion and Account Takeover in Keycloak Account REST API
Keycloak: Improper Access Control Leading to MFA Deletion and Account Takeover in Keycloak Account REST API
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.
No detection rules found.
No public exploits indexed.
Wiz
CVE-2026-3429 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 4.2
CVE-2026-3429 [MEDIUM] CVE-2026-3429 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-3429 :
Java vulnerability analysis and mitigation
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.
Source : NVD
## 4.2
Score
Published March 11, 2026
Severity MEDIUM
CNA Score 4.2
Affected Technologies
Java
Keycloak
Has Public Exploit No
Has CISA KEV Exploit No
CIS
Sans Isc
SANS Stormcast Tuesday, April 7th, 2026: Redirects in Phishing; Internet Bug Bounty Suspended; Bluehammer; Keycloak MFA Bypass
blogs_sans_isc·CVSS 4.2
[MEDIUM] SANS Stormcast Tuesday, April 7th, 2026: Redirects in Phishing; Internet Bug Bounty Suspended; Bluehammer; Keycloak MFA Bypass
Handler on Duty:
Johannes Ullrich
Threat Level:
Green
Podcast Detail
SANS Stormcast Tuesday, April 7th, 2026: Redirects in Phishing; Internet Bug Bounty Suspended; Bluehammer; Keycloak MFA Bypass
If you are not able to play the podcast using the player below: Use this direct link to the audio file: https://traffic.libsyn.com/securitypodcast/9882.mp3
previous
Redirects in Phishing; Internet Bug Bounty Suspended; Bluehammer; Keycloak MFA Bypass
00:00
My Next Class
Click HERE to learn more about classes Johannes is teaching for SANS
How often are redirects used in phishing in 2026?
https://isc.sans.edu/diary/How%20often%20are%20redirects%20used%20in%20phishing%20in%202026%3F/32870
Hackerone Suspends Internet Bug Bounty
https://hackerone.com/ibb?type=team
https://www.linkedin.com/posts/
2026-03-11
Published