Detect Mirasvit Full Page Cache Warmer Deserialization RCE (CVE-2026-45247) in CrowdStrike LogScale
Detects exploitation of CVE-2026-45247, a deserialization of untrusted data vulnerability in the Mirasvit Full Page Cache Warmer Magento extension. Successful exploitation allows remote attackers to execute arbitrary code by sending crafted serialized PHP objects to vulnerable endpoints. This CVE is listed in CISA KEV, indicating active exploitation in the wild.
MITRE ATT&CK
- Tactic
- Initial Access Execution Persistence
LogScale Detection Query
#event_simpleName=NetworkReceiveAccept OR #event_simpleName=HttpRequest
| CommandLine = /cache-warmer|cachewarmer|mirasvit.*warmer/i
OR RequestUrl = /cache-warmer|cachewarmer|mirasvit.*warmer/i
| HttpMethod IN ["POST", "PUT"]
| eval suspicious = case(
match(RequestBody, "O:[0-9]+:") OR match(RequestBody, "rO0") OR match(RequestBody, "YTo"), "serialized_payload",
BytesSent > 5000, "large_payload",
true(), "standard"
)
| where suspicious != "standard"
| groupby([RemoteAddressIP4, ComputerName, RequestUrl, HttpMethod, suspicious], function=count(aid, as=request_count))
| sort(request_count, order=desc)
| search request_count >= 1CrowdStrike Falcon query detecting HTTP POST/PUT requests to Mirasvit cache warmer paths on monitored endpoints, filtered for PHP serialization markers or anomalously large payloads indicative of CVE-2026-45247 exploitation.
Data Sources
Required Tables
False Positives & Tuning
- Authorized cache warming automation running on Magento servers
- Internal Magento queue workers sending POST requests to warm cache entries
- Red team or penetration testing activity against Magento environments
- Third-party Magento plugins that proxy requests through cache warmer endpoints
Other platforms for CVE-2026-45247
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Simulate Deserialization Probe to Cache Warmer Endpoint
Expected signal: POST request to /mirasvit/cachewarmer/collect visible in web access logs with payload containing 'O:8:' serialization marker; HTTP response code logged
- Test 2PHP Deserialization Gadget Chain Simulation (Lab)
Expected signal: PHP CLI process spawned with command-line containing unserialize() — visible in auditd execve records or CrowdStrike process telemetry
- Test 3Web Shell Drop Simulation Following Deserialization RCE
Expected signal: File creation event in /var/www/html/pub/ for a .php file by the web server user (www-data or nginx); auditd CREATE record or Falcon sensor file event
Unlock Pro Content
Get the full detection package for CVE-2026-45247 including response playbook, investigation guide, and atomic red team tests.