plone.app.textfield: Stored XSS by spoofing mime type
Impact
A stored XSS affecting RichText fields. RichTextValue.output returns the raw, unsanitized stored value whenever the stored mimeType equals the outputMimeType. Because the safe-HTML output type (text/x-html-safe) is the type that signifies "already sanitized", any value whose stored mimeType equals it bypasses the safe_html transform entirely on render. The transform itself is sound — it correctly strips on* event-handler attributes and javascript:/data: URIs; the defect is that it is never invoked for these values. The unsanitized value is then emitted via tal:content="structure ...", which performs no escaping, so the payload executes in the viewer's browser.
This can be a problem when a RichText field is wrongly defined in code with a mimeType and outputMimeType that are the same, or when the REST API is used to the same effect.
Patches
The problem has been patched:
- For Plone 6.0, upgrade
plone.app.textfieldto 2.0.2. - For Plone 6.1, upgrade
plone.app.textfieldto 3.0.2. - For Plone 6.2, upgrade
plone.app.textfieldto 4.0.1.
Workarounds
There is no known workaround.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | plone-app-textfield | < 2.0.2, >= 3.0.0, < 3.0.2, >= 4.0.0, < 4.0.1 | 2.0.2, 3.0.2, 4.0.1 |
Referencias
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N- Debilidad (CWE)
CWE-80- Plataforma
- Python (PyPI)
- Paquete
plone-app-textfield- Publicada
- 17.07.2026
- Actualizado
- 11.10.2026 14:18
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-3497 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-4r4f-gg25-rmg5 - CC BY 4.0
Historial de vulnerabilidades: plone-app-textfield
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