CVE-2020-10748: Keycloak parent Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-hgpg-593r-hhvp
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2020-10748 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Keycloak parent libraries in the Maven ecosystem. The issue involves cross-site scripting in keycloak. Remediation is available by upgrading affected packages to version 10.0.2.

CVE-2020-10748 at a Glance

CVE Identifier CVE-2020-10748
GHSA Identifier GHSA-hgpg-593r-hhvp
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Keycloak parent
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.1

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

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

How to Fix CVE-2020-10748

To remediate this vulnerability, upgrade all affected Keycloak parent 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-parent fixed: 10.0.2 
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-parent</artifactId>
    <version>10.0.2</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-2020-10748, 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 parent in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 10.0.2), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Keycloak parent, 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 flaw was found in Keycloak's data filter, in version 10.0.1, where it allowed the processing of data URLs in some circumstances. This flaw allows an attacker to conduct cross-site scripting or further attacks.

CVE-2020-10748 Affected Keycloak parent Versions

1 component(s)
Fixed Versions:
10.0.2
Product / Package Ecosystem Affected Versions Fixed Version
org.keycloak:keycloak-parent
maven/org.keycloak/keycloak-parent
Maven
< 10.0.2
10.0.2

References

NVD — CVE-2020-10748 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-10748
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=1836786

Frequently Asked Questions

What is CVE-2020-10748?
CVE-2020-10748 is a security vulnerability in Keycloak parent involving Cross-site Scripting in Keycloak under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Keycloak parent versions are affected?
Affected versions include releases prior to 10.0.2 across affected packages: org.keycloak:keycloak-parent.
What version fixes CVE-2020-10748?
Upgrading to 10.0.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is keycloak-parent affected?
Yes, org.keycloak:keycloak-parent is affected in releases prior to 10.0.2. Upgrade your dependency to 10.0.2 or later.
What is the CVSS score of CVE-2020-10748?
CVE-2020-10748 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-10748?
CVE-2020-10748 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Maven dependencies for CVE-2020-10748?
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-hgpg-593r-hhvp",
  "modified" : "2021-04-01T21:35:42Z",
  "published" : "2022-02-09T00:56:37Z",
  "aliases" : [ "CVE-2020-10748" ],
  "summary" : "Cross-site Scripting in Keycloak",
  "details" : "A flaw was found in Keycloak's data filter, in version 10.0.1, where it allowed the processing of data URLs in some circumstances. This flaw allows an attacker to conduct cross-site scripting or further attacks.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.keycloak:keycloak-parent"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "10.0.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 10.0.1"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-10748"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1836786"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-01T21:35:42Z",
    "nvd_published_at" : "2020-09-16T18:15:00Z"
  }
}