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

criticalknown exploitedpublic exploitCVE-2026-45247
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Mirasvitproduct: Full Page Cache WarmerUnsafe deserializationRemote code execution
What
The vulnerability allows unauthenticated attackers to achieve remote code execution through deserialization of untrusted data.
Who is affected
Users of Mirasvit Full Page Cache Warmer who do not have proper security measures in place.
Urgency
Immediate action is required as the vulnerability is actively exploited and poses a critical risk.
Action
Upgrade to the latest version of Mirasvit Full Page Cache Warmer to mitigate the risk.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-06-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-45247

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-45247coverage & exploitation statusNVD · CVE.org

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