plone.app.portlets vulnerable to denial of service via RSS feed portlet
Impact
By adding an RSS portlet, and giving this a link to a very large file, a member can cause a denial of service attack, because Plone will use lots of memory. The member could also use different urls to try to get information about the internal network and open port numbers (SSRF). A malicious RSS feed could cause stored XSS, when the url of a feed item is a javascript url.
Patches
The problem has been patched in plone.app.portlets.
- For Plone 6.2: upgrade to
plone.app.portlets7.0.2 - For Plone 6.1: upgrade to
plone.app.portlets6.0.4 - For Plone 6.0: upgrade to
plone.app.portlets5.0.8
Workarounds
If upgrading is not immediately possible:
- Restrict who can manage portlets: remove the
plone.app.portlets.ManageOwnPortletspermission from untrusted roles, and limit Manage portlets to trusted administrators (usually this is already restricted to the Manager and Site Administrator roles). - Where the RSS portlet is not needed, unregister it so it cannot be added. This would need to be done by editing a
portlets.xmlin your own code, so it is not a quick fix.
References
This is similar to this plone.app.event vulnerability. It was discovered by the Plone Security Team by thinking of similar cases to the plone.app.event problem.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | plone-app-portlets | >= 7.0.0, < 7.0.2, >= 6.0.0, < 6.0.4, < 5.0.8 | 7.0.2, 6.0.4, 5.0.8 |
Referencias
- https://github.com/plone/plone.app.portlets/security/advisories/GHSA-x5g3-w747-2h8q
- https://github.com/plone/plone.app.portlets/commit/09da52ef7b297daa8e0cfd2361e47c37d9b073ad
- https://github.com/plone/plone.app.portlets/commit/9f16b6fb10211916686c6c346ea174bf517e3fbd
- https://github.com/plone/plone.app.portlets/commit/a3b2c2887165b308cd915cbb87b8276f90a76680
- https://github.com/plone/plone.app.portlets/commit/df5e256baee55083cbd6b9a2623675d4cb26b6cd
- https://github.com/plone/plone.app.portlets
- https://pypi.org/project/plone-app-portlets
- https://github.com/advisories/GHSA-x5g3-w747-2h8q
- https://nvd.nist.gov/vuln/detail/CVE-2026-55248
- 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-portlets- Publicada
- 28.08.2026
- Actualizado
- 11.10.2026 15:18
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-3884 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-x5g3-w747-2h8q - CC BY 4.0
Historial de vulnerabilidades: plone-app-portlets
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
- 2
- Primera → última
- 08.2026 09.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 2
Divulgaciones por año
- 2026: 2
-
plone.app.portlets vulnerable to denial of service via RSS feed portlet esta entrada
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