CVE-2026-54159 ps_facetedsearch: PHP Object Injection in faceted search cache allows unauthenticated RCE
Unauthenticated attackers can achieve remote code execution by injecting malicious serialized PHP objects into the faceted search cache.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54159?
CVE-2026-54159 is a critical unsafe deserialization vulnerability in PrestaShop ps_facetedsearch, published on 17 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-74
Which versions are affected by CVE-2026-54159?
2 open source packages ship an affected version, including prestashop/ps_facetedsearch.
| Package | Affected | Fixed in |
|---|---|---|
prestashop/ps_facetedsearch Packagist | From 3.0.0 | 4.0.4 |
prestashop/ps_facetedsearch Packagist | From 3.0.0 | 4.0.4 |
How do I fix CVE-2026-54159?
Upgrade prestashop/ps_facetedsearch to 4.0.4 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-54159 being exploited?
There is no known exploitation of CVE-2026-54159 in the wild and no public exploit code.
Sources
Also known as GHSA-m5f5-28qr-9g9r.