Provide references for CVE-2021-35209.
Where can I find more information about CVE-2021-35209?
References are available at: https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories, https://wiki.zimbra.com/wiki/Security_Center, https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P16, https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P23, https://blog.sonarsource.com/zimbra-webmail-compromise-via-email.