CVE-2020-27826

keycloak: Account REST API can update user metadata attributes

Severity Score

4.2

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A flaw was found in Keycloak before version 12.0.0 where it is possible to update the user's metadata attributes using Account REST API. This flaw allows an attacker to change its own NameID attribute to impersonate the admin user for any particular application.

Se encontró un fallo en Keycloak versiones anteriores a 12.0.0, donde es posible actualizar los atributos de metadatos del usuario usando la API REST de la cuenta. Este fallo permite a un atacante cambiar su propio atributo NameID para hacerse pasar por el usuario administrador de cualquier aplicación en particular

Red Hat Single Sign-On 7.4 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications. This release of Red Hat Single Sign-On 7.4.4 serves as a replacement for Red Hat Single Sign-On 7.4.3, and includes bug fixes and enhancements, which are documented in the Release Notes document linked to in the References. Issues addressed include XML injection and remote SQL injection vulnerabilities.

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-10-27 CVE Reserved
2020-12-16 CVE Published
2024-08-04 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-250: Execution with Unnecessary Privileges

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=1905089	2020-12-15
https://access.redhat.com/security/cve/CVE-2020-27826	2020-12-15

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Redhat Search vendor "Redhat"		Keycloak Search vendor "Redhat" for product "Keycloak"				< 12.0.0 Search vendor "Redhat" for product "Keycloak" and version " < 12.0.0"		-		Affected
Redhat Search vendor "Redhat"		Single Sign-on Search vendor "Redhat" for product "Single Sign-on"				-		text-only		Affected
Redhat Search vendor "Redhat"		Single Sign-on Search vendor "Redhat" for product "Single Sign-on"				7.4 Search vendor "Redhat" for product "Single Sign-on" and version "7.4"		-		Affected
Redhat Search vendor "Redhat"		Single Sign-on Search vendor "Redhat" for product "Single Sign-on"				7.4.4 Search vendor "Redhat" for product "Single Sign-on" and version "7.4.4"		-		Affected