An issue exists in the `IntegrationTemplateProcessor.ReplaceTokens()` function where user-controlled values are substituted into event-integration templates without proper JSON encoding. An authenticated member can exploit this by setting their display name to include JSON metacharacters. This allows the injection of arbitrary key-value pairs into rendered payloads sent to webhook, SIEM, Slack, Teams, or Datadog endpoints. The injected fields are indistinguishable from legitimate template output when tokens such as `#ActingUserName#` or `#UserName#` are used.