*** IMP: Below should be installed only if recommended by Sitecore Support. Do check with them if it's needed for your Environment Setup. ***
We were recently contacted by Sitecore who identified and recommended a patch for a security issue (SC2019-001-302938). This being a security issue I highly suggest technical or admins to check with your local Sitecore Rep and apply below fix in your Sitecore Environments if needed.
Again make sure to verify with Sitecore before making any changes.
Versions Affected:
All versions of Sitecore XP 8.2, all
versions of Sitecore XP 9.0, and Initial Release of Sitecore XP 9.1.
Versions not affected
Sitecore CMS/XP versions 6.3—8.1 are not vulnerable.
Sitecore xDB Cloud environments are not affected.
In order to fix this issue apply the following patch (compatible with all affected versions): Sitecore.Support.302938-9.0.1.1 All related instructions are in the read me file.
Additional details about the issue are found here - https://kb.sitecore.net/articles/760963
