Detect Mirasvit Full Page Cache Warmer Deserialization RCE (CVE-2026-45247) in IBM QRadar
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
QRadar Detection Query
SELECT
DATEFORMAT(devicetime, 'yyyy-MM-dd HH:mm:ss') as event_time,
sourceip,
destinationip,
URL,
username,
"HTTP Method" as http_method,
"HTTP Response Code" as http_status,
"Bytes Sent" as payload_size,
LOGSOURCENAME(logsourceid) as log_source,
CATEGORYNAME(category) as event_category
FROM events
WHERE
devicetime > NOW() - 3600000
AND (
URL ILIKE '%cache-warmer%'
OR URL ILIKE '%cachewarmer%'
OR URL ILIKE '%mirasvit%warmer%'
)
AND "HTTP Method" IN ('POST', 'PUT')
AND (
"Bytes Sent" > 1000
OR PAYLOAD ILIKE '%O:%'
OR PAYLOAD ILIKE '%rO0%'
OR PAYLOAD ILIKE '%unserialize%'
)
ORDER BY devicetime DESC
LIMIT 1000Queries QRadar for HTTP POST/PUT requests to Mirasvit cache warmer endpoints with large payloads or serialized PHP object markers, which may indicate deserialization exploitation attempts against CVE-2026-45247.
Data Sources
Required Tables
False Positives & Tuning
- Automated cache warming scripts submitting large payloads during normal operation
- Vulnerability scanning tools probing Magento endpoints
- Internal API integrations that POST data to cache warmer endpoints
- Load balancer health checks targeting cache warming paths
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
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