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

Q: How do I fix CVE-2026-45247?

full page cache warmer: upgrade to 1.11.12. Exact commands for each OS are on this page.

Q: Is CVE-2026-45247 being exploited?

Yes. CVE-2026-45247 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2026-45247 affect?

CVE-2026-45247 affects full page cache warmer. Severity is critical (CVSS 9.8). 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 Ca

Q: How urgent is CVE-2026-45247?

Priority 92/100. Critical severity; EPSS top 2%: very likely to be exploited; Exploited in the wild (CISA KEV); CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Patch now

CRITICAL 9.8EXPLOITEDREMOTEUPGRADE

CVE-2026-45247 is a critical-severity flaw (CVSS 9.8) affecting full page cache warmer, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
EPSS top 2%: very likely to be exploited
Exploited in the wild (CISA KEV)
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	26.2% (top 2%)
CISA exploited list	Yes, fix due 2026-06-06
Weakness	CWE-502
Published	2026-05-26
Last modified	2026-07-24

Publisher (CNA): VulnCheck · Vendor: mirasvit

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-26 15:16 UTCPublished CVE record published
2026-06-03Exploited Added to the CISA Known Exploited Vulnerabilities list
2026-06-06Deadline CISA due date for US federal agencies to patch
2026-07-24 11:10 UTCUpdated Record last modified

mirasvit full page cache warmer UPGRADE

Affected: < 1.11.12

Fixed in: 1.11.12

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy full-page-cache-warmer || rpm -q full-page-cache-warmer || full-page-cache-warmer --version

2. UPGRADE to 1.11.12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade full-page-cache-warmer

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade full-page-cache-warmer

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora ELN · clash-meta · FIXED · 1.19.33-1.eln159 · FEDORA-2026-7dfb64c5e1 · source

sudo dnf upgrade --advisory=FEDORA-2026-7dfb64c5e1

Fedora 46 · vulkan-utility-libraries · FIXED · 1.4.363.0-1.fc46 · FEDORA-2026-994176daf5 · source

sudo dnf upgrade --advisory=FEDORA-2026-994176daf5

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: HORKimhab/CVE-2026-45247 (0 stars)
GitHub PoC: fevar54/PoC-Funcional---CVE-2026-45247-Mirasvit-Full-Page-Cache-Warmer-RCE- (0 stars)

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-45247?

full page cache warmer: upgrade to 1.11.12. Exact commands for each OS are on this page.

Is CVE-2026-45247 being exploited?

Yes. CVE-2026-45247 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2026-45247 affect?

CVE-2026-45247 affects full page cache warmer. Severity is critical (CVSS 9.8). 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 Ca

How urgent is CVE-2026-45247?

Priority 92/100. Critical severity; EPSS top 2%: very likely to be exploited; Exploited in the wild (CISA KEV); CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities · Magento vulnerabilities

References

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