Description

Symptoms can be different for some Sitecore versions, but the common problem is appearing of rel="noopener noreferrer" text snippets after adding hyperlinks to be opened in New Window (target_blank).

• For Sitecore XP 8.2 Update-6 + :
  Rich Text Editor duplicates the rel="noopener noreferrer" attribute in the <a> tag. For example:

   <a rel="noopener noreferrer" rel="noopener noreferrer" href="http://www.sitecore.com" 
  target="_blank"> Sitecore </a>

• For Sitecore XP 8.2 Update-4 and Sitecore XP 8.2 Update-5 :
  rel="noopener noreferrer" snippets appear at random places in the text outside the <a> tag. The problem appears when trying to add several hyperlinks.

Solution

To resolve this issue, consider one of the following options:

• For Sitecore XP 8.2 Update-4 - 9.0 Update-2, download and install the appropriate patch available on this page: https://github.com/SitecoreSupport/Sitecore.Support.223855/releases.
• For Sitecore XP 9.1 Initial Release - 9.2 Initial Release, upgrade the Sitecore instance to XP 9.3 Initial Release (recommended).