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CVE-2026-54503

CVE-2026-54503 · plone.app.textfield: Stored XSS by spoofing mime type

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 4.3 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • plone.app.textfield

    Versions
    • < 2.0.2: Affected
    • >= 3.0.0, < 3.0.2: Affected
    • >= 4.0.0, < 4.0.1: Affected

    No fix published

  • plone-app-textfield PyPI

    Versions
    • 1.0
    • 1.0.1
    • 1.0.2
    • 1.0b1
    • 1.0b2
    • 1.0b3
    • 1.0b4
    • 1.0b5
    • 1.0b6
    • 1.0b7
    • 1.1
    • 1.2
    • 1.2.1
    • 1.2.10
    • 1.2.11
    • 1.2.12
    • 1.2.2
    • 1.2.3
    • 1.2.4
    • 1.2.5
    • 1.2.6
    • 1.2.7
    • 1.2.8
    • 1.2.9
    • 1.3.0
    • 1.3.1
    • 1.3.2
    • 1.3.3
    • 1.3.4
    • 1.3.5
    • 1.3.6
    • 1.3.7
    • 2.0.0
    • 2.0.1
    Affected ranges
    • ECOSYSTEM: < 2.0.2

    Update to 2.0.2

  • plone-app-textfield PyPI

    Versions
    • 3.0.0
    • 3.0.1
    Affected ranges
    • ECOSYSTEM: ≥ 3.0.0, < 3.0.2

    Update to 3.0.2

  • plone-app-textfield PyPI

    Versions
    • 4.0.0
    Affected ranges
    • ECOSYSTEM: ≥ 4.0.0, < 4.0.1

    Update to 4.0.1

  • plone-app-textfield PyPI

    Versions
    • 1.0
    • 1.0.1
    • 1.0.2
    • 1.0b1
    • 1.0b2
    • 1.0b3
    • 1.0b4
    • 1.0b5
    • 1.0b6
    • 1.0b7
    • 1.1
    • 1.2
    • 1.2.1
    • 1.2.10
    • 1.2.11
    • 1.2.12
    • 1.2.2
    • 1.2.3
    • 1.2.4
    • 1.2.5
    • 1.2.6
    • 1.2.7
    • 1.2.8
    • 1.2.9
    • 1.3.0
    • 1.3.1
    • 1.3.2
    • 1.3.3
    • 1.3.4
    • 1.3.5
    • 1.3.6
    • 1.3.7
    • 2.0.0
    • 2.0.1
    • 3.0.0
    • 3.0.1
    • 4.0.0
    Affected ranges
    • ECOSYSTEM: < 2.0.2 ∪ ≥ 3.0.0, < 3.0.2 ∪ ≥ 4.0.0, < 4.0.1

    Update to 2.0.2; Update to 3.0.2; Update to 4.0.1

Original sources

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