Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability (CVE-2026-45247)
Severity: critical · Patch status: unknown · Since 2026-06-03 · CVE-2026-45247
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. CISA added CVE-2026-45247 to its Known Exploited Vulnerabilities catalog on Jun 3, 2026, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Jun 6, 2026 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch