CVE-2021-33510: Plone

Medium severity, CVSS 4.3. EPSS: 1% chance of exploitation in the next 30 days.

Plone through 5.2.4 allows remote authenticated managers to conduct SSRF attacks via an event ical URL, to read one line of a file.

Affected products

• Plone Plone: up to and including 5.2.4

Published 2021-05-21. Last modified 2026-06-17.