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PrestaShop has multiple stored XSS vulnerabilities via unprotected Template variables

High severity GitHub Reviewed Published Mar 23, 2026 in PrestaShop/PrestaShop

Package

composer prestashop/prestashop (Composer)

Affected versions

>= 9.0.0-alpha.1, < 9.1.0
< 8.2.5

Patched versions

9.1.0
8.2.5

Description

Impact

Multiple stored Cross-Site Scripting (stored XSS) vulnerabilities in the BO: an attacker who can inject data into the database, via limited back-office access or a previously existing vulnerability, can exploit unprotected variables in back-office templates.

Patches

Patched on 8.2.5 and 9.1.0

Workarounds

None

References

None

References

@jolelievre jolelievre published to PrestaShop/PrestaShop Mar 23, 2026
Published to the GitHub Advisory Database Mar 25, 2026
Reviewed Mar 25, 2026

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
High
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H

EPSS score

Weaknesses

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. Learn more on MITRE.

CVE ID

CVE-2026-33673

GHSA ID

GHSA-35pf-37c6-jxjv

Source code

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