---
id: CVE-2026-54159
aliases:
  - GHSA-m5f5-28qr-9g9r
title: >-
  prestashop/ps_facetedsearch: PHP Object Injection in faceted search cache
  allows unauthenticated RCE
summary: >-
  prestashop/ps_facetedsearch: PHP Object Injection in faceted search cache
  allows unauthenticated RCE
severity: critical
cvss: 10
cwe:
  - CWE-74
vendor: prestashop
product: prestashop/ps_facetedsearch
ecosystem: composer
affected:
  - 'prestashop/ps_facetedsearch >= 3.0.0, < 4.0.4'
patched:
  - prestashop/ps_facetedsearch 4.0.4
published: '2026-07-10'
updated: '2026-07-10'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-m5f5-28qr-9g9r'
references:
  - url: >-
      https://github.com/PrestaShop/ps_facetedsearch/security/advisories/GHSA-m5f5-28qr-9g9r
  - url: 'https://github.com/advisories/GHSA-m5f5-28qr-9g9r'
tags:
  - ghsa
  - composer
ingestedAt: '2026-07-10T21:06:31.420Z'
---

## Overview

### Impact

A PHP Object Injection vulnerability affects the PrestaShop module `ps_facetedsearch`.

The module rebuilds the selected search filters from the request URL. The value of a slider filter (**price** or **weight**) is taken from the URL without sufficient validation, then stored in an internal filter-block cache where it is serialized and later read back with a raw native `unserialize()`.
By crafting that value, an attacker can smuggle a malicious serialized PHP object into the cache. When it is deserialized, a gadget chain writes an arbitrary PHP file inside the module directory, which is then used as a webshell to run commands on the server.

### Who is impacted

Any shop using a vulnerable version of `ps_facetedsearch` that displays a filter template containing a slider filter (price or weight). Exploitation is remote and **unauthenticated**, a single crafted front-office request is enough, and leads to remote code
execution and full compromise of the shop and its server.

**Affected versions:** `3.0.0` through `4.0.3` (all versions since 3.0.0, including the latest release).


### Patches

Upgrade the `ps_facetedsearch` module to the patched version. Upgrading the module is the best action that removes the vulnerability.

Otherwise, you can apply the fix manually in the file `src/Filters/Block.php`:

In the `getFromCache()` method, replace the native `unserialize()` call:

```php
// Before
if (!empty($row)) {
    return unserialize(current($row));
}

// After
if (!empty($row)) {
    return \Tools::unSerialize(current($row));
}
```

### Until the module is upgraded:

- Remove price and weight slider filters from the filter templates that are exposed on the
  front office.
- Clear the faceted-search filter cache, and audit the `modules/ps_facetedsearch/` directory for
  unexpected PHP files.
- Monitor search requests for PHP serialization patterns (`O:`, `;i:`, references to classes such
  as `Monolog\…`) and block them at the WAF level.

### Resources

- Thank you to Frédéric Moreau (Antadis) and Gilles Caudal (Datalinx) for reporting this vulnerability.

## Affected packages

- `prestashop/ps_facetedsearch >= 3.0.0, < 4.0.4`

## Remediation

Upgrade to a patched release:

- `prestashop/ps_facetedsearch 4.0.4`