Possible Citrix NetScaler CVE-2023-4966 Session Token Disclosure
- Category
- webserver
- Author
- HuntRule
- Published
- 2026-06-25
- Updated
- 2026-08-28
ATT&CK techniques
Initial Access → Cred AccessRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects HTTP requests to the OpenID configuration discovery endpoints on Citrix NetScaler that are abused by CVE-2023-4966 to disclose session memory and steal valid session tokens. When paired with an abnormally large Host header these requests indicate exploitation attempts against an exposed NetScaler appliance for session hijacking.
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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