plone.app.event vulnerable to denial of service via iCalendar import
Impact
By abusing the iCalendar import functionality, a logged-in editor could take the whole site offline, make the server reach into the internal network and read calendar files off disk (SSRF), and store XSS.
Patches
The problem has been patched in plone.app.event.
- For Plone 6.2: upgrade to
plone.app.event6.0.1 - For Plone 6.1: upgrade to
plone.app.event5.2.4 - For Plone 6.0: upgrade to
plone.app.event5.2.4
Workarounds
In the site root, go to the Security tab of the Zope Management Interface (manage_access), look for the "plone.app.event: Import Ical" permission, and grant this only to the Manager role. Then only users with the Manager role can use the ical import form.
There is no workaround for the stored XSS in the URL field of events.
The vulnerabilities were discovered by Timothy Dudley and responsibly reported to the Plone Security Team. Thank you!
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | plone-app-event | < 5.2.4, >= 6.0.0a1, < 6.0.1 | 5.2.4, 6.0.1 |
Referencias
- https://github.com/plone/plone.app.event/security/advisories/GHSA-r82h-mqw3-fc56
- https://github.com/plone/plone.app.event/commit/1e3c83c15a24d1a789cdb012593505bc5620e28e
- https://github.com/plone/plone.app.event/commit/4de5eb3ea9e4f7f1781622e6d64fc086629d1437
- https://github.com/plone/plone.app.event
- https://github.com/plone/plone.app.event/releases/tag/5.2.4
- https://github.com/plone/plone.app.event/releases/tag/6.0.1
- https://pypi.org/project/plone-app-event
- https://github.com/advisories/GHSA-r82h-mqw3-fc56
- https://nvd.nist.gov/vuln/detail/CVE-2026-55247
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H- Debilidad (CWE)
CWE-400- Plataforma
- Python (PyPI)
- Paquete
plone-app-event- Publicada
- 28.08.2026
- Actualizado
- 11.10.2026 15:18
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-3883 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-r82h-mqw3-fc56 - CC BY 4.0
Historial de vulnerabilidades: plone-app-event
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 4
- Primera → última
- 12.2020 08.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Alta 3
Divulgaciones por año
- 2020: 3
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 1
-
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