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CVE-2026-55247
9.1 CRITICAL
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): Low (L)
- User Interaction (UI): None (N)
- Scope (S): Changed (C)
- Confidentiality (C): Low (L)
- Integrity (I): Low (L)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): Low (L)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): Low (L)
- Modified Scope (MS): Changed (C)
- Modified Integrity (MI): Low (L)
- Modified Availability (MA): High (H)
Activity log
- Created & dismissed (no matching packages found) suggestion
plone.app.event: Denial of service via iCalendar import
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.
References
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https://github.com/plone/plone.app.event/security/advisories/GHSA-r82h-mqw3-fc56 x_refsource_CONFIRM
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https://github.com/plone/plone.app.event/releases/tag/5.2.4 x_refsource_MISC
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https://github.com/plone/plone.app.event/releases/tag/6.0.1 x_refsource_MISC
Affected products
plone.app.event
- ==< 5.2.4
- ==>= 6.0.0, < 6.0.1