What is CVE-2026-45247?

CVE-2026-45247 is a critical-severity vulnerability in Mirasvit Full Page Cache Warmer, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-05-26.

How severe is CVE-2026-45247?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-45247 known to be exploited?

Yes. CVE-2026-45247 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-03), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.

Deserialization in Mirasvit Full Page Cache Warmer

CVE-2026-45247

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.

Vulnerability class: Insecure Deserialization

EPSS: 0.275 (97.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mirasvit Full_page_cache_warmer
Mirasvit Full Page Cache Warmer For Magento 2 — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2026-06-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2026-06-06.

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.

Public proof-of-concept exploits

References

disclosure@vulncheck.com (technical-description, Third Party Advisory)
disclosure@vulncheck.com (release-notes, Release Notes, patch)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Third Party Advisory)

Frequently asked questions

What is CVE-2026-45247?: CVE-2026-45247 is a critical-severity vulnerability in Mirasvit Full Page Cache Warmer, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-05-26.
How severe is CVE-2026-45247?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-45247 known to be exploited?: Yes. CVE-2026-45247 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-03), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.