Red Hat Keycloak improper authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.8$5k-$25k0.00

Summaryinfo

A vulnerability classified as critical was found in Red Hat Keycloak. Affected is an unknown function. Executing a manipulation can lead to improper authorization. This vulnerability is registered as CVE-2026-0871. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Red Hat Keycloak (version unknown). It has been declared as critical. This vulnerability affects an unknown function. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A flaw was found in Keycloak. An administrator with `manage-users` permission can bypass the "Only administrators can view" setting for unmanaged attributes, allowing them to modify these attributes. This improper access control can lead to unauthorized changes to user profiles, even when the system is configured to restrict such modifications.

The advisory is shared for download at bugzilla.redhat.com. This vulnerability was named CVE-2026-0871. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation requires an enhanced level of successful authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 03/05/2026). The MITRE ATT&CK project declares the attack technique as T1548.002.

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-2026-9005) and CERT Bund (WID-SEC-2026-0072). Once again VulDB remains the best source for vulnerability data.

Affected

  • Red Hat Enterprise Linux
  • Open Source Keycloak

Productinfo

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.8

VulDB Base Score: 4.7
VulDB Temp Score: 4.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.9
CNA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / CWE-266
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

01/13/2026 Advisory disclosed
01/13/2026 +0 days VulDB entry created
03/05/2026 +51 days VulDB entry last update

Sourcesinfo

Vendor: redhat.com

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2026-0871 (🔒)
GCVE (CVE): GCVE-0-2026-0871
GCVE (VulDB): GCVE-100-340900
EUVD: 🔒
CERT Bund: WID-SEC-2026-0072 - Keycloak: Schwachstelle ermöglicht Manipulation von Dateien

Entryinfo

Created: 01/13/2026 20:36
Updated: 03/05/2026 03:58
Changes: 01/13/2026 20:36 (48), 01/14/2026 00:43 (7), 02/27/2026 10:12 (1), 02/27/2026 13:59 (1), 03/05/2026 03:58 (12)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

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