Red Hat Keycloak Identity-first Login information exposure

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.7$5k-$25k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Red Hat Keycloak. The affected element is an unknown function of the component Identity-first Login. This manipulation causes information exposure. This vulnerability is handled as CVE-2026-4633. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Red Hat Keycloak (affected version not known). It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the component Identity-first Login. The manipulation with an unknown input leads to a information exposure vulnerability. The CWE definition for the vulnerability is CWE-209. The product generates an error message that includes sensitive information about its environment, users, or associated data. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The advisory is shared at access.redhat.com. This vulnerability is known as CVE-2026-4633 since 03/23/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 04/01/2026). MITRE ATT&CK project uses the attack technique T1592 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-14400) and CERT Bund (WID-SEC-2026-0821). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Open Source Keycloak

Productinfo

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 3.7
NVD Vector: 🔒

CNA Base Score: 3.7
CNA Vector (redhat): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Information exposure
CWE: CWE-209 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/23/2026 Advisory disclosed
03/23/2026 +0 days CVE reserved
03/23/2026 +0 days VulDB entry created
04/01/2026 +9 days VulDB entry last update

Sourcesinfo

Vendor: redhat.com

Advisory: access.redhat.com
Status: Confirmed

CVE: CVE-2026-4633 (🔒)
GCVE (CVE): GCVE-0-2026-4633
GCVE (VulDB): GCVE-100-352501
EUVD: 🔒
CERT Bund: WID-SEC-2026-0821 - Keycloak: Mehrere Schwachstellen

Entryinfo

Created: 03/23/2026 13:53
Updated: 04/01/2026 16:40
Changes: 03/23/2026 13:53 (60), 03/23/2026 14:35 (7), 03/23/2026 15:48 (1), 04/01/2026 16:40 (10)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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