PHP Object Injection in Magento Cache Warmer Extension

Mirasvit Full Page Cache Warmer for Magento 2 before version 1.11.12 contains a PHP object injection vulnerability that allows unauthenticated attackers to achieve remote code execution by supplying a crafted serialized PHP object in the CacheWarmer cookie. Attackers can exploit the unrestricted call to PHP's native unserialize() function combined with gadget chains available in Magento and its dependencies to execute arbitrary code on the server.

Casky was already ahead

This CVE exploits attack patterns that Casky's 419matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

Mirasvit's Full Page Cache Warmer extension for Magento 2 contains a critical PHP object injection vulnerability (CWE-502) that allows unauthenticated attackers to execute arbitrary code. The vulnerability stems from unsafe deserialization of untrusted data in the CacheWarmer cookie parameter, where the application directly passes user-controlled input to PHP's unserialize() function without validation. This affects all Magento 2 installations using versions before 1.11.12 of this popular caching extension. The attack requires no authentication and can be triggered remotely by any user, making it a severe risk for e-commerce platforms that rely on this extension to optimize performance.

Casky's security skills leverage Claude's extended reasoning to map this vulnerability across three critical MITRE ATT&CK techniques: Initial Access (TA0001) through unauthenticated exploitation of the exposed cache warmer endpoint, Execution (TA0002) via arbitrary code execution through gadget chain exploitation, and Defense Evasion (TA0043) by leveraging the serialization mechanism to bypass traditional input validation. Practitioners using Casky would identify this threat through detection of suspicious serialized PHP objects in cookie parameters, unusual gadget chain patterns associated with Magento framework classes, and unexpected PHP execution flowing from cache operations. The 419 matching skills would correlate cookie-based injection attempts with post-exploitation behaviors, allowing security teams to detect both attempted exploitation and successful compromise from a single suspicious web request.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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419 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-45247.

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malware analysis · medium

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MITRE ATT&CK Techniques

TA0001 TA0043 TA0002

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