HTTP requests containing cross-site scripting patterns

Classification:

attack

Tactic:

TA0001-initial-access

Technique:

T1189-drive-by-compromise

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Goal

Detect HTTP requests whose query strings contain common cross-site scripting patterns, including when responses succeed.

Strategy

This rule monitors OCSF HTTP query strings for XSS-oriented payloads and correlates with successful HTTP responses where applicable, grouped by @ocsf.src_endpoint.ip.

Triage and response

  • Check whether payloads are reflected in responses or stored and served to other users.
  • Remediate output encoding or input validation on affected routes.