GHSA-vfgc-c76h-mwh4: Drupal/core Cross-Site Scripting Vulnerability

MODERATE
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CVSS 5.3
CWE-79
Published
Advisory Summary

GHSA-vfgc-c76h-mwh4 is a MODERATE (CVSS 5.3) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Drupal/core libraries in the Packagist ecosystem. The issue involves drupal core cross-site scripting (xss) vulnerabilities. Remediation is available by upgrading affected packages to version 8.9.18, 9.1.12, 9.2.4.

GHSA-vfgc-c76h-mwh4 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-vfgc-c76h-mwh4
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Drupal/core
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.3

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

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

How to Fix GHSA-vfgc-c76h-mwh4

To remediate this vulnerability, upgrade all affected Drupal/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.

drupal/core fixed: 8.9.18 
Upgrade drupal/core to 8.9.18
drupal/core fixed: 9.1.12 
Upgrade drupal/core to 9.1.12
drupal/core fixed: 9.2.4 
Upgrade drupal/core to 9.2.4
Verify Direct and Transitive Dependencies

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

inspect dependencies for drupal/core

How to Check if You Are Affected

To determine whether your application is affected by GHSA-vfgc-c76h-mwh4, inspect your project dependencies for Drupal/core:

inspect dependencies for drupal/core

Analyze the terminal output to locate any version of Drupal/core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.9.18), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

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 Drupal/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

The Drupal project uses the CKEditor, library for WYSIWYG editing. CKEditor has released a security update that impacts Drupal. Vulnerabilities are possible if Drupal is configured to allow use of the CKEditor library for WYSIWYG editing. An attacker that can create or edit content (even without access to CKEditor themselves) may be able to exploit one or more Cross-Site Scripting (XSS) vulnerabilities to target users with access to the WYSIWYG CKEditor, including site admins with privileged access.

GHSA-vfgc-c76h-mwh4 Affected Drupal/core Versions

3 component(s)
Fixed Versions:
8.9.189.1.129.2.4
Product / Package Ecosystem Affected Versions Fixed Version
drupal/core
 Packagist
≥ 8.0.0
< 8.9.18
8.9.18
drupal/core
 Packagist
≥ 9.1.0
< 9.1.12
9.1.12
drupal/core
 Packagist
≥ 9.2.0
< 9.2.4
9.2.4

References

Drupal/core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/2021-05-26.yaml
Drupal/core Source Repository REPOSITORY
https://github.com/drupal/core
www.drupal.org/sa-core-2021-005 WEB
https://www.drupal.org/sa-core-2021-005

Frequently Asked Questions

What is GHSA-vfgc-c76h-mwh4?
GHSA-vfgc-c76h-mwh4 is a security vulnerability in Drupal/core involving Drupal core Cross-Site Scripting (XSS) vulnerabilities under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Drupal/core versions are affected?
Affected versions include releases prior to 8.9.18, 9.1.12, 9.2.4 across affected packages: drupal/core.
What version fixes GHSA-vfgc-c76h-mwh4?
Upgrading to 8.9.18, 9.1.12, 9.2.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is drupal/core affected?
Yes, drupal/core is affected in releases prior to 8.9.18, 9.1.12, 9.2.4. Upgrade your dependency to 8.9.18, 9.1.12, 9.2.4 or later.
What is the CVSS score of GHSA-vfgc-c76h-mwh4?
GHSA-vfgc-c76h-mwh4 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N.
What CWE is associated with GHSA-vfgc-c76h-mwh4?
GHSA-vfgc-c76h-mwh4 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 Packagist dependencies for GHSA-vfgc-c76h-mwh4?
Run the dependency tree command: 'inspect dependencies for drupal/core'. 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-vfgc-c76h-mwh4",
  "modified" : "2024-05-15T20:51:25Z",
  "published" : "2024-05-15T20:51:25Z",
  "aliases" : [ ],
  "summary" : "Drupal core Cross-Site Scripting (XSS) vulnerabilities",
  "details" : "The Drupal project uses the CKEditor, library for WYSIWYG editing. CKEditor has released a security update that impacts Drupal.\n\nVulnerabilities are possible if Drupal is configured to allow use of the CKEditor library for WYSIWYG editing. An attacker that can create or edit content (even without access to CKEditor themselves) may be able to exploit one or more Cross-Site Scripting (XSS) vulnerabilities to target users with access to the WYSIWYG CKEditor, including site admins with privileged access.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0"
      }, {
        "fixed" : "8.9.18"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.1.0"
      }, {
        "fixed" : "9.1.12"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.2.0"
      }, {
        "fixed" : "9.2.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/2021-05-26.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/drupal/core"
  }, {
    "type" : "WEB",
    "url" : "https://www.drupal.org/sa-core-2021-005"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-05-15T20:51:25Z",
    "nvd_published_at" : null
  }
}