Pimcore up to 11.5.16/12.3.6 Authentication.php unserialize deserialization

Summaryinfo

A vulnerability was found in Pimcore up to 11.5.16/12.3.6. It has been rated as critical. This issue affects the function unserialize of the file lib/Tool/Authentication.php. Performing a manipulation results in deserialization. This vulnerability is identified as CVE-2026-45162. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Pimcore up to 11.5.16/12.3.6. This affects the function unserialize of the file lib/Tool/Authentication.php. The manipulation with an unknown input leads to a deserialization vulnerability. CWE is classifying the issue as CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Pimcore is an Open Source Data & Experience Management Platform. Prior to 11.5.17 (LTS) and 12.3.7, multiple Pimcore locations call PHP's unserialize() on data from database columns and filesystem files without the allowed_classes restriction, including lib/Tool/Authentication.php, models/Site/Dao.php, models/DataObject/ClassDefinition/CustomLayout/Dao.php, models/Tool/TmpStore/Dao.php, models/Asset/WebDAV/Service.php, and admin-ui-classic-bundle/src/Helper/Dashboard.php, enabling object injection and remote code execution if an attacker can control the serialized data source. This issue is fixed in versions 11.5.17 (LTS) and 12.3.7.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-45162 since 05/08/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

By approaching the search of inurl:lib/Tool/Authentication.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 11.5.17 or 12.3.7 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-45259). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Information Management Software

Name

• Pimcore

Version

• 11.5.0
• 11.5.1
• 11.5.2
• 11.5.3
• 11.5.4
• 11.5.5
• 11.5.6
• 11.5.7
• 11.5.8
• 11.5.9
• 11.5.10
• 11.5.11
• 11.5.12
• 11.5.13
• 11.5.14
• 11.5.15
• 11.5.16
• 12.3.0
• 12.3.1
• 12.3.2
• 12.3.3
• 12.3.4
• 12.3.5
• 12.3.6

License

• open-source

Website

• Product: https://github.com/pimcore/pimcore/

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Be aware that VulDB is the high quality source for vulnerability data.

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