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

Overview

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.

Vulnerability details

CVE ID

CVE-2026-45247

Vulnerability

Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability

Vendor

Mirasvit

Affected products

Mirasvit: Mirasvit Full Page Cache Warmer

Severity

HIGH

Exploitation status

Actively exploited in the wild (CISA KEV)

EPSS score

1.5% probability of exploitation in 30 days · 71th percentile

Published

2026-06-03

Remediation guidance

CVE-2026-45247 is in CISA's Known Exploited Vulnerabilities (KEV) catalog — U.S. federal civilian agencies are required to remediate it under Binding Operational Directive 22-01. Treat it as a priority for every environment.

Apply the vendor's official security update for Mirasvit the affected product as soon as possible. Where a patch is unavailable, apply vendor mitigations or isolate/segment exposed systems.

FIRST EPSS estimates a 1.5% probability that CVE-2026-45247 will be exploited within the next 30 days (71th percentile of all CVEs) — useful for risk-based patch sequencing.

Hunt for indicators of compromise tied to this vulnerability and confirm logging/EDR coverage on affected assets.

Authoritative references

• NVD — National Vulnerability Database
• MITRE CVE Record
• CISA Known Exploited Vulnerabilities Catalog
• FIRST EPSS — Exploit Prediction Scoring