CVE-2026-44212: Prestashop/prestashop Cross-Site Scripting Vulnerability

CRITICAL
Advisory Identifier: GHSA-w9f3-qc75-qgx9
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CVSS 9.3
CWE-79
Published
Advisory Summary

CVE-2026-44212 is a CRITICAL (CVSS 9.3) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Prestashop/prestashop libraries in the Packagist ecosystem. The issue involves prestashop has a stored xss executable in customer service view. Remediation is available by upgrading affected packages to version 8.2.6, 9.1.1.

CVE-2026-44212 at a Glance

CVE Identifier CVE-2026-44212
GHSA Identifier GHSA-w9f3-qc75-qgx9
Severity CRITICAL
CVSS v3.1 Base Score 9.3
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Prestashop/prestashop
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 9.3

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:H/I:H/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 High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-44212

To remediate this vulnerability, upgrade all affected Prestashop/prestashop 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/prestashop fixed: 8.2.6 
Upgrade prestashop/prestashop to 8.2.6
prestashop/prestashop fixed: 9.1.1 
Upgrade prestashop/prestashop to 9.1.1
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/prestashop

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-44212, inspect your project dependencies for Prestashop/prestashop:

inspect dependencies for prestashop/prestashop

Analyze the terminal output to locate any version of Prestashop/prestashop in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.2.6), 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/prestashop, 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 This is a **stored Cross-site Scripting (XSS)** vulnerability in the PrestaShop back-office Customer Service view. An unauthenticated attacker can submit the public Contact Us form with a malicious email address. The payload is stored in the database and executed when a back-office employee opens the affected customer thread, enabling session hijacking and full back-office takeover. ### Patches Patched in PrestaShop 8.2.6 and 9.1.1. ### Workarounds None. ### Resources - Reported by Savio at Doyensec (`anthropic@doyensec.com`) in collaboration with Anthropic Research.

CVE-2026-44212 Affected Prestashop/prestashop Versions

2 component(s)
Fixed Versions:
8.2.69.1.1
Product / Package Ecosystem Affected Versions Fixed Version
prestashop/prestashop
 Packagist
< 8.2.6
8.2.6
prestashop/prestashop
 Packagist
≥ 9.0.0
< 9.1.1
9.1.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/PrestaShop/PrestaShop/security/advisories/GHSA-w9f3-qc75-qgx9
Prestashop/prestashop Source Repository REPOSITORY
https://github.com/PrestaShop/PrestaShop

Frequently Asked Questions

What is CVE-2026-44212?
CVE-2026-44212 is a security vulnerability in Prestashop/prestashop involving PrestaShop has a stored XSS executable in customer service view under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Prestashop/prestashop versions are affected?
Affected versions include releases prior to 8.2.6, 9.1.1 across affected packages: prestashop/prestashop.
What version fixes CVE-2026-44212?
Upgrading to 8.2.6, 9.1.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is prestashop/prestashop affected?
Yes, prestashop/prestashop is affected in releases prior to 8.2.6, 9.1.1. Upgrade your dependency to 8.2.6, 9.1.1 or later.
What is the CVSS score of CVE-2026-44212?
CVE-2026-44212 has a CVSS v3.1 base score of 9.3 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.
What CWE is associated with CVE-2026-44212?
CVE-2026-44212 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-2026-44212?
Run the dependency tree command: 'inspect dependencies for prestashop/prestashop'. 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-w9f3-qc75-qgx9",
  "modified" : "2026-05-08T16:54:22Z",
  "published" : "2026-05-08T16:54:22Z",
  "aliases" : [ "CVE-2026-44212" ],
  "summary" : "PrestaShop has a stored XSS executable in customer service view",
  "details" : "### Impact\n\nThis is a **stored Cross-site Scripting (XSS)** vulnerability in the PrestaShop back-office Customer Service view.\n\nAn unauthenticated attacker can submit the public Contact Us form with a malicious email address. The payload is stored in the database and executed when a back-office employee opens the affected customer thread, enabling session hijacking and full back-office takeover.\n\n### Patches\n\nPatched in PrestaShop 8.2.6 and 9.1.1.\n\n### Workarounds\n\nNone.\n\n### Resources\n\n- Reported by Savio at Doyensec (`anthropic@doyensec.com`) in collaboration with Anthropic Research.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "prestashop/prestashop"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "8.2.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "prestashop/prestashop"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.1.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/PrestaShop/PrestaShop/security/advisories/GHSA-w9f3-qc75-qgx9"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/PrestaShop/PrestaShop"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-08T16:54:22Z",
    "nvd_published_at" : null
  }
}