CVE-2026-55247
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
plone.app.event before versions 5.2.4 and 6.0.1 has a vulnerability in the iCalendar import that 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 store a malicious event URL that executes script in another user's browser. This issue is fixed in versions 5.2.4 and 6.0.1.
Risk Assessment
An attacker can perform SSRF attacks, cause denial of service, and execute XSS scripts in other users' browsers, threatening confidentiality and availability.
Recommendation
Upgrade plone.app.event to version 5.2.4 or 6.0.1 and restrict iCalendar import privileges to trusted editors.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

