Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2026-06-03
• Critical severity: CVSS 9.8

[ Description ]Official description

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.

CISA: Mirasvit Full Page Cache Warmer contains a deserialization of untrusted data vulnerability that could allow unauthenticated attackers to achieve remote code execution by supplying a crafted serialized PHP object in the CacheWarmer cookie.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 6 Jun 2026): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• mirasvit.com/package/changelogRelease Notes
• sansec.io/research/mirasvit-cache-warmer-object-injectionThird Party Advisory
• www.vulncheck.com/advisories/mirasvit-cache-warmer-for-magento-php-object-injectionThird Party Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource
• www.imperva.com/blog/imperva-customers-protected-against-cve-2026-45247-in-mirasvit-ful…Third Party Advisory