Possible Sitecore Experience Platform Pre-Auth RCE via TypeConfuseDelegate Gadget (via webserver)
- Category
- webserver
- Author
- HuntRule
- Published
- 2026-08-19
- Updated
- 2026-08-28
ATT&CK techniques
Initial Access → ExecutionRecon
Resource Dev
Initial Access
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects POST requests to the Sitecore Reporting Report.ashx handler carrying a parameters XML body with NetDataContractSerializer and TypeConfuseDelegate gadget markers. This is the pre-auth deserialization RCE CVE-2021-42237 that reaches Process.Start on the server. Detecting it exposes code-execution attempts against internet-facing Sitecore Experience Platform instances.
Reporting behind it
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.
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