CVE-2026-45247: Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability
CVE-2026-45247 is a Severity not scored in source feed flaw in Mirasvit Mirasvit Full Page Cache Warmer. 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. It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-03), meaning it is being actively exploited. The fix: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Source: CISA Known Exploited Vulnerabilities Catalog. Data as of 2026-06-13.
Vulnerability details
| Field | Value |
|---|---|
| CVE ID | CVE-2026-45247 |
| Vulnerability | Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability |
| Vendor / product | Mirasvit — Mirasvit Full Page Cache Warmer |
| CVSS base score | Not in source feed |
| Severity | — |
| Weakness (CWE) | CWE-502 |
| Added to CISA KEV | 2026-06-03 |
| CISA remediation due | 2026-06-06 |
| Known ransomware use | Unknown |
Source: CISA Known Exploited Vulnerabilities Catalog. Data as of 2026-06-13.
What is the risk?
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.
How to remediate CVE-2026-45247
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
U.S. federal civilian agencies were required to remediate this vulnerability by 2026-06-06 under CISA Binding Operational Directive 22-01. Private organizations should treat it with comparable urgency.
References
Frequently asked questions
What is CVE-2026-45247?
CVE-2026-45247 is a vulnerability in Mirasvit Mirasvit Full Page Cache Warmer: 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.
How severe is CVE-2026-45247?
The CISA KEV catalog does not publish a CVSS base score for this entry. Check the NVD record for the official score. Its presence in the KEV catalog means it is confirmed to be exploited in the wild.
Is CVE-2026-45247 being exploited in the wild?
Yes. It appears in the CISA Known Exploited Vulnerabilities (KEV) catalog, which only lists vulnerabilities with reliable evidence of active exploitation. It was added on 2026-06-03.
How do I fix CVE-2026-45247?
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
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Last updated: 2026-06-13