CVE-2020-10686: Keycloak core Keycloak Users May Be Able Vulnerability

MODERATE
Advisory Identifier: GHSA-9695-w6h2-jpv9
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CVSS 4.7
CWE-285
Published
Advisory Summary

CVE-2020-10686 is a MODERATE (CVSS 4.7) keycloak users may be able vulnerability (CWE-285: Improper Authorization) affecting Keycloak core libraries in the Maven ecosystem. The issue involves keycloak users may be able to remove mfa from other users' devices. Remediation is available by upgrading affected packages to version 9.0.2.

CVE-2020-10686 at a Glance

CVE Identifier CVE-2020-10686
GHSA Identifier GHSA-9695-w6h2-jpv9
Severity MODERATE
CVSS v3.1 Base Score 4.7
CWE Classification CWE-285: Improper Authorization
Affected Product Keycloak core
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2020-10686

To remediate this vulnerability, upgrade all affected Keycloak core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.keycloak:keycloak-core fixed: 9.0.2 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-core</artifactId>
    <version>9.0.2</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.keycloak

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-10686, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.keycloak

Analyze the terminal output to locate any version of Keycloak core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.0.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.keycloak command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-285: Improper Authorization, where the product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. In Keycloak core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A community-only flaw was found where a malicious user can register himself and then uses the "remove devices" form to post different credential ids with the hope of removing MFA devices for other users.

CVE-2020-10686 Affected Keycloak core Versions

1 component(s)
Fixed Versions:
9.0.2
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-core
maven/org.keycloak/keycloak-core
Maven
< 9.0.2
9.0.2

References

NVD — CVE-2020-10686 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-10686
Security Fix Commit FIX COMMIT
https://github.com/keycloak/keycloak/commit/5ddd605ee96b8551c7eb00b609a0b97939925b77
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10686
Keycloak core Source Repository REPOSITORY
https://github.com/keycloak/keycloak

Frequently Asked Questions

What is CVE-2020-10686?
CVE-2020-10686 is a security vulnerability in Keycloak core involving Keycloak users may be able to remove MFA from other users' devices under CWE-285: Improper Authorization.
Which Keycloak core versions are affected?
Affected versions include releases prior to 9.0.2 across affected packages: org.keycloak:keycloak-core.
What version fixes CVE-2020-10686?
Upgrading to 9.0.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is keycloak-core affected?
Yes, org.keycloak:keycloak-core is affected in releases prior to 9.0.2. Upgrade your dependency to 9.0.2 or later.
What is the CVSS score of CVE-2020-10686?
CVE-2020-10686 has a CVSS v3.1 base score of 4.7 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2020-10686?
CVE-2020-10686 is classified under CWE-285: Improper Authorization (The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.).
How can I check Maven dependencies for CVE-2020-10686?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.keycloak'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9695-w6h2-jpv9",
  "modified" : "2024-04-23T17:37:22Z",
  "published" : "2022-05-24T17:17:05Z",
  "aliases" : [ "CVE-2020-10686" ],
  "summary" : "Keycloak users may be able to remove MFA from other users' devices",
  "details" : "A community-only flaw was found where a malicious user can register himself and then uses the \"remove devices\" form to post different credential ids with the hope of removing MFA devices for other users. ",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "9.0.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 9.0.1"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-10686"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/keycloak/keycloak/commit/5ddd605ee96b8551c7eb00b609a0b97939925b77"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10686"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/keycloak/keycloak"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-285" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-23T17:37:22Z",
    "nvd_published_at" : "2020-05-04T21:15:00Z"
  }
}