Insecure Deserialization in TrueLayer Magento 2 Plugin

Executive Summary

CVE-2026-103831 is an insecure deserialization vulnerability in the Psr16CacheAdapter component of the TrueLayer Magento 2 Plugin. It occurs because the plugin uses PHP's unserialize() function without proper class restrictions when retrieving cached data. An attacker with the ability to write to the cache backend (like Redis or Memcached) could inject malicious PHP objects and trigger their deserialization, potentially leading to arbitrary code execution.

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Detection Guidance

Detection requires checking for the TrueLayer Magento 2 Plugin and verifying if the Psr16CacheAdapter component uses PHP's unserialize() without class restrictions. Inspect Magento cache configuration files and cache backend settings for Redis or Memcached. Look for unusual serialized data in cache storage.

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Impact Analysis

If exploited, this vulnerability could allow an attacker to execute arbitrary code on your system. This requires the attacker to first gain the ability to write to your cache infrastructure, such as through local file system access or a network-accessible cache. Successful exploitation could lead to full system compromise, data theft, or further attacks within your environment.

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Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality principles or HIPAA's security requirements for protected health information. A successful exploit may result in data breaches, triggering compliance violations, legal penalties, and reputational damage for affected organizations.

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Mitigation Strategies

Update the TrueLayer Magento 2 Plugin to the latest version that patches this vulnerability. Disable PHP's unserialize() for cache data or implement strict class whitelisting. Restrict write access to cache backends like Redis or Memcached to trusted users only.

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