---
title: "CVE-2026-45247: Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-45247/
description: "CVE-2026-45247 (Mirasvit Mirasvit Full Page Cache Warmer): Exploited in the wild (CISA KEV). Mirasvit Full Page Cache Warmer for Magento 2 before version…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-26
date_modified: 2026-06-04
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-45247"
kev: true
cvss: 9.3
epss: 0.02085
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-45247: Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Mirasvit Mirasvit Full Page Cache Warmer. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-06-03, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-06-06 ; treat that as the outer limit, not the target.
- EPSS 2.1% , percentile 81: FIRST’s model estimates a 2.1% chance of exploitation activity in the next 30 days, higher than 81% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- Mirasvit Full Page Cache Warmer for Magento 2: < 1.11.12

## Severity

- VulnCheck CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
- VulnCheck CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-06-03; federal due date 2026-06-06. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 2.08% probability of exploitation activity in the next 30 days; percentile 81.

## Sources

- [mirasvit.com](https://mirasvit.com/package/changelog/?package=mirasvit/module-cache-warmer)
- [CVE.org record CVE-2026-45247](https://www.cve.org/CVERecord?id=CVE-2026-45247)
- [NVD entry CVE-2026-45247](https://nvd.nist.gov/vuln/detail/CVE-2026-45247)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45247)
- [sansec.io](https://sansec.io/research/mirasvit-cache-warmer-object-injection)
- [vulncheck.com](https://www.vulncheck.com/advisories/mirasvit-cache-warmer-for-magento-php-object-injection)
- [imperva.com](https://www.imperva.com/blog/imperva-customers-protected-against-cve-2026-45247-in-mirasvit-full-page-cache-warmer-for-magento/)

---
Source page: https://erroneo.us/security/cve/CVE-2026-45247/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt