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High, CVSS 7.6

PrestaShop has multiple stored XSS vulnerabilities via unprotected Template variables

CVE-2026-33673GHSA-35pf-37c6-jxjv

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (prestashop/prestashop 9.1.0, 8.2.5), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.6 · CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
EPSS
  • CVE-2026-33673: 0.27% estimated exploitation activity in the next 30 days; percentile 19.99 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-35pf-37c6-jxjv

Agent brief

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# Patch Next advisory brief: CVE-2026-33673

Advisory: PrestaShop has multiple stored XSS vulnerabilities via unprotected Template variables
IDs: CVE-2026-33673, GHSA-35pf-37c6-jxjv
Record: https://patchnext.com/advisories/cve-2026-33673 (revision 1, source checked 26 Oct 2026, 14:39 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: prestashop/prestashop 9.1.0, 8.2.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist prestashop/prestashop: affected >= 9.0.0-alpha.1, < 9.1.0; < 8.2.5; fixed in 9.1.0, 8.2.5

## Suggested inspection (read-only)
- Packagist prestashop/prestashop: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on prestashop/prestashop.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-35pf-37c6-jxjv (GitHub-reviewed advisory GHSA-35pf-37c6-jxjv lists affected ranges: Packagist prestashop/prestashop >=9.0.0-alpha.1 =0 <8.2.5)

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