CVE-2026-55247
Description
plone.app.event provides the event content type for Plone. Prior to versions 5.2.4 and 6.0.1, the iCalendar import in src/plone/app/event/ical/importer.py accepts insufficiently restricted calendar and event URLs, does not adequately bound downloaded bytes or imported events, and commits work per event. A logged-in editor can make the server request internal network resources or local calendar files, exhaust resources and take the site offline, and store a malicious event URL that executes script in another user's browser. The fix restricts accepted URLs, applies MAXIMUM_ICAL_IMPORT_SIZE_BYTES and MAXIMUM_ICAL_IMPORT_EVENTS limits, uses transaction savepoints, and validates event URLs. This issue is fixed in versions 5.2.4 and 6.0.1.
How to fix
- plone-app-event5.2.4, 6.0.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| plone-app-eventPyPI | v < 5.2.4, 6.0.0a1 ≤ v < 6.0.1 | 5.2.4, 6.0.1 |
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