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CVE-2026-45247

Deserialization of Untrusted Data — is CVE-2026-45247real, exploitable, or a false positive? Here's the community ground truth.

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Critical · CVSS 9.8EPSS 1.5%CISA KEVCWE-502 · Deserialization of Untrusted Data

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

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.

References

NVD MITRE CVE.org CISA KEV

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Community ground truth

Community verdict

3 verdicts
Not a real issue

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Community real-world severity: Critical (Critical 3) — CVSS base score 9.8

In line with its CVSS base score.

Field notes & remediation

Verdicts are the quick signal — notes are the evidence and fixes behind them.

  • 0
    Field note · Hanna BergCurated

    Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability — 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. Listed in the CISA KEV catalog (added 2026-06-03) — confirmed exploited in the wild, not theoretical. FIRST EPSS puts the chance of exploitation in the next 30 days at ~2%. Treat it as real and prioritize remediation over triage.

  • 0
    Remediation · Sam WhitakerCurated

    Required action for Mirasvit Mirasvit Full Page Cache Warmer: 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 set a federal remediation due date of 2026-06-06. After patching, verify the vulnerable path is no longer reachable before closing the finding.

Related CVEs

Same weakness — CWE-502 · Deserialization of Untrusted Data.