Plone plone.app.textfield up to 2.0.1/3.0.1/4.0.0 Output RichTextValue.output cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, was found in Plone plone.app.textfield up to 2.0.1/3.0.1/4.0.0. This issue affects the function RichTextValue.output of the component Output. The manipulation results in cross site scripting. This vulnerability is cataloged as CVE-2026-54503. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Plone plone.app.textfield up to 2.0.1/3.0.1/4.0.0. Affected is the function RichTextValue.output of the component Output. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

plone.app.textfield provides a zope.schema-style field type called RichText for storing a value with a related MIME type. Prior to 2.0.2, 3.0.2, and 4.0.1, depending on the release line, RichTextValue.output returns an unsanitized stored RichText value when mimeType equals outputMimeType, including values that claim the text/x-html-safe output type. This equality shortcut bypasses the safe_html transform even though the transform itself correctly removes event-handler attributes and unsafe URI schemes. Equal types can result from a RichText field configured with the same mimeType and outputMimeType or from REST API input that supplies text/x-html-safe as its content type. The raw stored value is then emitted through tal:content=structure without escaping, allowing a user who can set a RichText field to store JavaScript that executes in a viewer's browser. This issue is fixed in versions 2.0.2, 3.0.2, and 4.0.1.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-54503 since 06/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 2.0.2, 3.0.2 or 4.0.1 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• Plone

Name

• plone.app.textfield

Version

• 2.0.0
• 2.0.1
• 3.0.0
• 3.0.1
• 4.0

License

• open-source

Website

• Product: https://github.com/plone/plone.app.textfield/

CPE 2.3info

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