Plone before 5.2.3 allows SSRF attacks via the tracebacks feature (only available to the Manager role).
1.01.0.11.0.21.0.31.0.41.0.51.0.61.0a11.0a21.0b1+84 more3.2.10Exploitability
AV:NAC:LAT:NPR:LUI:NVulnerable System
VC:HVI:HVA:HSubsequent System
SC:NSI:NSA:NCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N