CVE-2021-21418: Prestashop/ps emailsubscription Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-vwfx-hh3w-fj99
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CVSS 4.6
CWE-79
Published
Advisory Summary

CVE-2021-21418 is a MODERATE (CVSS 4.6) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Prestashop/ps emailsubscription libraries in the Packagist ecosystem. The issue involves potential xss injection in the newsletter conditions field. Remediation is available by upgrading affected packages to version 2.6.1.

CVE-2021-21418 at a Glance

CVE Identifier CVE-2021-21418
GHSA Identifier GHSA-vwfx-hh3w-fj99
Severity MODERATE
CVSS v3.1 Base Score 4.6
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Prestashop/ps emailsubscription
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.6

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:U/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 Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2021-21418

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

prestashop/ps_emailsubscription fixed: 2.6.1 
Upgrade prestashop/ps_emailsubscription to 2.6.1
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 prestashop/ps_emailsubscription

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-21418, inspect your project dependencies for Prestashop/ps emailsubscription:

inspect dependencies for prestashop/ps_emailsubscription

Analyze the terminal output to locate any version of Prestashop/ps emailsubscription in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.6.1), 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 Prestashop/ps emailsubscription, 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

### Impact An employee can inject javascript in the newsletter condition field that will then be executed on the front office ### Patches The issue has been fixed in 2.6.1

CVE-2021-21418 Affected Prestashop/ps emailsubscription Versions

1 component(s)
Fixed Versions:
2.6.1
Product / Package Ecosystem Affected Versions Fixed Version
prestashop/ps_emailsubscription
 Packagist
< 2.6.1
2.6.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/PrestaShop/ps_emailsubscription/security/advisories/GHSA-vwfx-hh3w-fj99
NVD — CVE-2021-21418 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21418
Security Fix Commit FIX COMMIT
https://github.com/PrestaShop/ps_emailsubscription/commit/664ffb225e2afb4a32640bbedad667dc6e660b70
Prestashop/ps emailsubscription Release RELEASE
https://github.com/PrestaShop/ps_emailsubscription/releases/tag/v2.6.1
packagist.org/packages/prestashop... WEB
https://packagist.org/packages/prestashop/ps_emailsubscription

Frequently Asked Questions

What is CVE-2021-21418?
CVE-2021-21418 is a security vulnerability in Prestashop/ps emailsubscription involving Potential XSS injection in the newsletter conditions field under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Prestashop/ps emailsubscription versions are affected?
Affected versions include releases prior to 2.6.1 across affected packages: prestashop/ps_emailsubscription.
What version fixes CVE-2021-21418?
Upgrading to 2.6.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is prestashop/ps_emailsubscription affected?
Yes, prestashop/ps_emailsubscription is affected in releases prior to 2.6.1. Upgrade your dependency to 2.6.1 or later.
What is the CVSS score of CVE-2021-21418?
CVE-2021-21418 has a CVSS v3.1 base score of 4.6 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2021-21418?
CVE-2021-21418 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-2021-21418?
Run the dependency tree command: 'inspect dependencies for prestashop/ps_emailsubscription'. 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-vwfx-hh3w-fj99",
  "modified" : "2021-03-31T17:35:42Z",
  "published" : "2021-04-06T17:24:14Z",
  "aliases" : [ "CVE-2021-21418" ],
  "summary" : "Potential XSS injection in the newsletter conditions field",
  "details" : "### Impact\nAn employee can inject javascript in the newsletter condition field that will then be executed on the front office\n\n### Patches\nThe issue has been fixed in 2.6.1",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "prestashop/ps_emailsubscription"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.6.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/PrestaShop/ps_emailsubscription/security/advisories/GHSA-vwfx-hh3w-fj99"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21418"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/PrestaShop/ps_emailsubscription/commit/664ffb225e2afb4a32640bbedad667dc6e660b70"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/PrestaShop/ps_emailsubscription/releases/tag/v2.6.1"
  }, {
    "type" : "WEB",
    "url" : "https://packagist.org/packages/prestashop/ps_emailsubscription"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-31T17:35:42Z",
    "nvd_published_at" : "2021-03-31T18:15:00Z"
  }
}