CVE-2026-4633 | BDVDB-2026-322012 Detail

Red HatRed Hat build of Keycloak 26.4.12

Description#

A flaw was found in Keycloak. A remote attacker can exploit differential error messages during the identity-first login flow when Organizations are enabled. This vulnerability allows an attacker to determine the existence of users, leading to information disclosure through user enumeration.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

CWE-209 Generation of Error Message Containing Sensitive Information

References#

Exploit#

No public exploit known

History#

Version 12026-03-23Record published in the CVE List.
Version 22026-10-22Most recent update recorded in the CVE List.

Published

Published: 2026-03-23
Last modified: 2026-10-22

Vendor information

Vendor: Red Hat
Product: Red Hat build of Keycloak 26.4.12

All Red Hat vulnerabilities

Score

3.7 Low

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 36.8.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

No version data in the source record.

Scoring System

CVSS v4.0

Not available

CVSS v3.1

3.7 Low

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

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity	None
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).