Provide references for CVE-2021-33926.
Where can I find more information about CVE-2021-33926?
References are available at: https://plone.org/security/hotfix/20210518, https://github.com/s-kustm/Subodh/blob/master/Plone%205.2.4%20Vulnerable%20to%20bilend%20SSRF.pdf, https://plone.org/security/hotfix/20210518/blind-ssrf-via-feedparser-accessing-an-internal-url.