CVE entry · CVE-2026-45247
CVE-2026-45247: 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.
- Actively exploited: added to CISA’s KEV catalog on June 3, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: June 6, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Mirasvit Full Page Cache Warmer, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.