CVE-2020-13666: Drupal/core Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-8jj2-x2gc-ggm7
Share
CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2020-13666 is a MODERATE (CVSS 6.1) 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 vulnerability. Remediation is available by upgrading affected packages to version 8.8.10, 8.9.6, 9.0.6, 7.73.

CVE-2020-13666 at a Glance

CVE Identifier CVE-2020-13666
GHSA Identifier GHSA-8jj2-x2gc-ggm7
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 Drupal/core
Package Ecosystem Packagist
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-2020-13666

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: 8.8.10 
Upgrade drupal/core to 8.8.10
drupal/core fixed: 8.9.6 
Upgrade drupal/core to 8.9.6
drupal/core fixed: 9.0.6 
Upgrade drupal/core to 9.0.6
drupal/core fixed: 7.73 
Upgrade drupal/core to 7.73
drupal/drupal fixed: 7.73 
Upgrade drupal/drupal to 7.73
drupal/drupal fixed: 8.8.10 
Upgrade drupal/drupal to 8.8.10
drupal/drupal fixed: 8.9.6 
Upgrade drupal/drupal to 8.9.6
drupal/drupal fixed: 9.0.6 
Upgrade drupal/drupal to 9.0.6
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 CVE-2020-13666, 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 8.8.10), 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

Cross-site scripting vulnerability in Drupal Core. Drupal AJAX API does not disable JSONP by default, allowing for an XSS attack. This issue affects: Drupal Drupal Core 7.x versions prior to 7.73; 8.8.x versions prior to 8.8.10; 8.9.x versions prior to 8.9.6; 9.0.x versions prior to 9.0.6.

CVE-2020-13666 Affected Drupal/core Versions

8 component(s)
Fixed Versions:
8.8.108.9.69.0.67.73
Product / Package Ecosystem Affected Versions Fixed Version
drupal/core
 Packagist
≥ 8.8.0
< 8.8.10
8.8.10
drupal/core
 Packagist
≥ 8.9.0
< 8.9.6
8.9.6
drupal/core
 Packagist
≥ 9.0.0
< 9.0.6
9.0.6
drupal/core
 Packagist
≥ 7.0.0
< 7.73
7.73
drupal/drupal
 Packagist
≥ 7.0.0
< 7.73
7.73
drupal/drupal
 Packagist
≥ 8.8.0
< 8.8.10
8.8.10
drupal/drupal
 Packagist
≥ 8.9.0
< 8.9.6
8.9.6
drupal/drupal
 Packagist
≥ 9.0.0
< 9.0.6
9.0.6

References

NVD — CVE-2020-13666 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-13666
Drupal/core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2020-13666.yaml
Drupal/core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2020-13666.yaml
Drupal/core Source Repository REPOSITORY
https://github.com/drupal/core
www.drupal.org/sa-core-2020-007 WEB
https://www.drupal.org/sa-core-2020-007

Frequently Asked Questions

What is CVE-2020-13666?
CVE-2020-13666 is a security vulnerability in Drupal/core involving Drupal Core Cross-site scripting vulnerability 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 8.8.10, 8.9.6, 9.0.6, 7.73 across affected packages: drupal/core, drupal/drupal.
What version fixes CVE-2020-13666?
Upgrading to 8.8.10, 8.9.6, 9.0.6, 7.73 (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 8.8.10, 8.9.6, 9.0.6, 7.73. Upgrade your dependency to 8.8.10, 8.9.6, 9.0.6, 7.73 or later.
Is drupal/drupal affected?
Yes, drupal/drupal is affected in releases prior to 7.73, 8.8.10, 8.9.6, 9.0.6. Upgrade your dependency to 7.73, 8.8.10, 8.9.6, 9.0.6 or later.
What is the CVSS score of CVE-2020-13666?
CVE-2020-13666 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-2020-13666?
CVE-2020-13666 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 CVE-2020-13666?
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-8jj2-x2gc-ggm7",
  "modified" : "2024-04-23T22:29:32Z",
  "published" : "2022-05-24T17:49:27Z",
  "aliases" : [ "CVE-2020-13666" ],
  "summary" : "Drupal Core Cross-site scripting vulnerability",
  "details" : "Cross-site scripting vulnerability in Drupal Core. Drupal AJAX API does not disable JSONP by default, allowing for an XSS attack. This issue affects: Drupal Drupal Core 7.x versions prior to 7.73; 8.8.x versions prior to 8.8.10; 8.9.x versions prior to 8.9.6; 9.0.x versions prior to 9.0.6.",
  "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" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.8.0"
      }, {
        "fixed" : "8.8.10"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.9.0"
      }, {
        "fixed" : "8.9.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.0.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0.0"
      }, {
        "fixed" : "7.73"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/drupal"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0.0"
      }, {
        "fixed" : "7.73"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/drupal"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.8.0"
      }, {
        "fixed" : "8.8.10"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/drupal"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.9.0"
      }, {
        "fixed" : "8.9.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/drupal"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.0.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-13666"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2020-13666.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2020-13666.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/drupal/core"
  }, {
    "type" : "WEB",
    "url" : "https://www.drupal.org/sa-core-2020-007"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-23T22:29:32Z",
    "nvd_published_at" : "2021-05-05T14:15:00Z"
  }
}