We have a Sitecore 8.2.4 installation and the Production environments sits behind Cloudflare.

On the CM instance, our Content Editors keep getting interrupted by a (broken) captcha dialogue box from Cloudflare. This seems to happen for some popup dialogues and also the Experience Editor is broken with a similar popup displayed.

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When sensitivity is set to "LOW" the Captcha will still show. When set to "OFF" the captcha will not show.

I am wondering if anyone would know which OWASP rule exactly is Sitecore triggering that might be causing the Captcha to display?

1 Answer 1


After speaking to Sitecore Support I received the following answer. I hope this can help someone else experiencing the same situation.

  • Sitecore client/backend does not support running behind a CDN especially when caching and OWASP ruleset are enabled.
  • Sitecore has registered a feature request for the product so that it can be considered for future implementation. To track the future status of this request, please use the reference number 199315.
  • In the meantime, please consider not using OWASP ruleset, since it breaks your solution behaviour.

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