CyberRota Analysis
AI-GeneratedThe vulnerability affects the iCalendar import functionality in plone.app.event prior to versions 5.2.4 and 6.0.1, allowing logged-in editors to exploit insufficiently restricted calendar URLs to exhaust server resources or execute scripts in other users' browsers. This could lead to denial-of-service conditions and cross-site scripting attacks. Organizations using affected versions should prioritize updating to the patched releases to mitigate these critical risks.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD 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.