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CRITICAL · CVSS 9.8 CISA Known Exploited Vulnerability

CVE-2026-45247

Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability

Mirasvit Full Page Cache Warmer

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.

CVSS
9.8
CRITICAL
EPSS
27.5%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
26 May 2026
CWE-502

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 3 June 2026. US federal agencies were required to remediate it by 6 June 2026.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 27.5%, which is higher than 97.9% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Frequently asked questions

Is CVE-2026-45247 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2026-45247.

What does CVE-2026-45247 affect?

CVE-2026-45247 affects Mirasvit Full Page Cache Warmer. 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.

How severe is CVE-2026-45247?

CVE-2026-45247 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 27.5%, higher than 97.9% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 6 June 2026.

How should organisations respond to CVE-2026-45247?

Apply the vendor patch for Mirasvit Full Page Cache Warmer as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.