CVE-2026-9798

Low

No strong exploitation signal.

CVSS base

4.3 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

EPSS — probability of exploitation (30 days)

0.3%

28.4th percentile

CISA KEV

Not listed

Weakness / dates

CWE-305

Published 2026-05-28 · modified 2026-08-20

CVSS breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Attack Vector	N	Network
Attack Complexity	L	Low
Privileges Required	N	None
User Interaction	R	Required
Scope	U	Unchanged
Confidentiality	L	Low
Integrity	N	None
Availability	N	None

Timeline

2026-05-28 — Published (NVD)
2026-08-20 — Last modified (NVD)

Description

A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication (CIBA) flow to bypass this brute-force protection. This allows continued authentication attempts and token issuance even when the account should be locked, potentially enabling further unauthorized access attempts.

Affected

redhat

References

Official: NVD · CVE.org