CVE-2026-45247
Actively exploited. CVE-2026-45247 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-03) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2026-45247 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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
- 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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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 98% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-45247 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2026-45247: Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerabilitycisa-kev · 2026-06-03
External references
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[](https://www.csirts.com/cve/CVE-2026-45247)