CVE-2020-19626: Craftcms/cms Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-33jj-92px-m4g7
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CVSS 5.4
CWE-79
Published
Advisory Summary

CVE-2020-19626 is a MODERATE (CVSS 5.4) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Craftcms/cms libraries in the Packagist ecosystem. The issue involves craft cms cross-site scripting vulnerability. Remediation is available by upgrading affected packages to version 3.1.33.

CVE-2020-19626 at a Glance

CVE Identifier CVE-2020-19626
GHSA Identifier GHSA-33jj-92px-m4g7
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Craftcms/cms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.4

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2020-19626

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

craftcms/cms fixed: 3.1.33 
Upgrade craftcms/cms to 3.1.33
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 craftcms/cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-19626, inspect your project dependencies for Craftcms/cms:

inspect dependencies for craftcms/cms

Analyze the terminal output to locate any version of Craftcms/cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.33), 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 Craftcms/cms, 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 (XSS) vulnerability in craftcms 3.1.31, allows remote attackers to inject arbitrary web script or HTML, via `/admin/settings/sites/new`.

CVE-2020-19626 Affected Craftcms/cms Versions

1 component(s)
Fixed Versions:
3.1.33
Product / Package Ecosystem Affected Versions Fixed Version
craftcms/cms
 Packagist
< 3.1.33
3.1.33

References

NVD — CVE-2020-19626 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-19626
Security Fix Commit FIX COMMIT
https://github.com/craftcms/cms/commit/76a2168b6a5e30144f5c06da4ff264f4eca577ff
web.archive.org/web/20211209121705/... WEB
https://web.archive.org/web/20211209121705/http://mayoterry.com/file/cve/XSS_vuluerability_in_Craftcms_3.1.31.pdf

Frequently Asked Questions

What is CVE-2020-19626?
CVE-2020-19626 is a security vulnerability in Craftcms/cms involving Craft CMS Cross-site Scripting Vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Craftcms/cms versions are affected?
Affected versions include releases prior to 3.1.33 across affected packages: craftcms/cms.
What version fixes CVE-2020-19626?
Upgrading to 3.1.33 (or the latest patched release for your respective branch) resolves the vulnerability.
Is craftcms/cms affected?
Yes, craftcms/cms is affected in releases prior to 3.1.33. Upgrade your dependency to 3.1.33 or later.
What is the CVSS score of CVE-2020-19626?
CVE-2020-19626 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-19626?
CVE-2020-19626 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-2020-19626?
Run the dependency tree command: 'inspect dependencies for craftcms/cms'. 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-33jj-92px-m4g7",
  "modified" : "2024-02-01T21:17:50Z",
  "published" : "2022-05-24T17:45:29Z",
  "aliases" : [ "CVE-2020-19626" ],
  "summary" : "Craft CMS Cross-site Scripting Vulnerability",
  "details" : "Cross Site Scripting (XSS) vulnerability in craftcms 3.1.31, allows remote attackers to inject arbitrary web script or HTML, via `/admin/settings/sites/new`.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "craftcms/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.1.33"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-19626"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/commit/76a2168b6a5e30144f5c06da4ff264f4eca577ff"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20211209121705/http://mayoterry.com/file/cve/XSS_vuluerability_in_Craftcms_3.1.31.pdf"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-02-01T21:17:50Z",
    "nvd_published_at" : "2021-03-26T15:15:00Z"
  }
}