pimcore/pimcore security advisory

CVE-2026-55220: Pimcore Hotspotimage getDataFromResource() unrestricted Serialize::unserialize over object-store column (PHP Object Injection, CWE-502)

CVE-2026-55220 is a critical-severity PHP object injection vulnerability in the PHP package pimcore/pimcore (CVSS 9.3), published 28 August 2026. The advisory does not name a fixed version. It can be exploited without an account.

critical 9.3 published 2026-08-28 · updated 2026-09-09

Affected versions: <= 12.3.9
>= 2026.1.0, <= 2026.1.5
Fixed in: not stated
Newest release: 2026.3.4
Severity: Critical · CVSS 9.3
Type: PHP object injection
CWE-502
Exploited in the wild: Not on the CISA KEV list
checked 2026-11-04

Is your pimcore/pimcore version affected?

Run composer show pimcore/pimcore in your project, then enter the version. We check it against this and every other known pimcore/pimcore advisory.

Who can exploit CVE-2026-55220

Access: No account. Anyone who can send a request to an app that uses the affected code.

CVSS vector (scored by GitHub): CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Your app is only exposed if it uses the affected part of pimcore/pimcore. The advisory below says which part that is. If you are not sure, upgrade anyway: it costs less than finding out.

How to fix CVE-2026-55220 in pimcore/pimcore

Find the installed version: composer show pimcore/pimcore. If you never required it yourself, composer why pimcore/pimcore shows which package pulls it in.
Update it: composer update pimcore/pimcore --with-all-dependencies.
If Composer will not go that high, your composer.json constraint is holding it back. Widen it (for example "pimcore/pimcore": "^2026.3.4" if you can take that version), or upgrade the package that requires it.
Run composer audit. It reads the same advisory data and should no longer list CVE-2026-55220.
Commit composer.lock and deploy it. On the server, run composer install --no-dev from the lock file, not composer update.

If you cannot upgrade yet

General hardening for PHP object injection issues while the upgrade waits. None of it replaces the fix.

Never pass user-controlled data to unserialize() or to template rendering, and restrict who can edit templates or settings.
Put a web application firewall in front of the app and watch for new PHP files or admin users.
If your app does not use the affected feature, note that in your audit, but still plan the upgrade.

The CVE-2026-55220 advisory

Pimcore is an Open Source Data & Experience Management Platform. Prior to 11.5.19, 12.3.10, and 2026.1.6, Pimcore\Model\DataObject\ClassDefinition\Data\Hotspotimage::getDataFromResource() in models/DataObject/ClassDefinition/Data/Hotspotimage.php passes the field __hotspots object-store column to Pimcore\Tool\Serialize::unserialize() without an allowed-classes restriction after JSON decoding fails. An attacker with a separate capability to write crafted PHP serialized bytes into that column can instantiate available classes and trigger magic methods when an affected DataObject is loaded, which can produce arbitrary file writes or code execution through bundled gadget chains. The related ImageGallery, Block, and Video callers use the same fallback pattern, but the identified June fix changes the Hotspotimage caller only. This issue is fixed for Hotspotimage in versions 11.5.19, 12.3.10, and 2026.1.6.

Description from the CVE record, published by GitHub (the CVE Numbering Authority), via the NVD entry for CVE-2026-55220. Advisory title: “Pimcore Hotspotimage getDataFromResource() unrestricted Serialize::unserialize over object-store column (PHP Object Injection, CWE-502)”.

References

GitHub advisory GHSA-w23p-wrp7-ch38 github.com
Fix commit b184c01 github.com
Pull request #19181 github.com
Release v12.3.10 github.com
Release v2026.1.6 github.com

Other pimcore/pimcore advisories

high CVE-2026-55416: Pimcore: SQL Injection in Custom Reports via Malicious Report Configuration 2026-09-10
critical CVE-2026-55634: Pimcore Vulnerable to Remote Code Execution via DataObject Class-Definition Field Name 2026-08-28
high CVE-2026-55072: Pimcore: ClassDefinition UID regex missing end anchor allows SQL injection via Block.php unquoted table name 2026-08-13
high CVE-2026-11407: Pimcore CMS Twig Sandbox Bypass via SecurityPolicy checkMethodAllowed 2026-06-17
high CVE-2026-5394: Pimcore Platform - SQL Injection in DataObject composite index handling during class definition import/save 2026-05-28
high CVE-2026-45704: Pimcore has a CustomReports Share Bypass 2026-05-27

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Where this data comes from

Affected and fixed versions: the Packagist security advisories API (GitHub Advisory Database and FriendsOfPHP), the same data composer audit uses. Synced 2026-11-03.
Description, score, weakness and references: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
Exploited-in-the-wild status: the CISA Known Exploited Vulnerabilities catalog, checked 2026-11-04.
Compiled by Daniel Lasek at Laskyr from the sources above. The summary, “who can exploit it”, “how to fix it” and hardening sections are our plain-English reading of the record and are generated from it. The quoted description is the record's own text. Spot an error? Tell us.