plone.app.textfield: Stored XSS by spoofing mime type

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54503
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-15 17:17:21 UTC
Updated2026-09-15 19:17:20 UTC
Descriptionplone.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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Problem Types: CWE-80 | CWE-80 CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Plone Plone.app.textfield affected < 2.0.2 Not specified
CNA Plone Plone.app.textfield affected >= 3.0.0, < 3.0.2 Not specified
CNA Plone Plone.app.textfield affected >= 4.0.0, < 4.0.1 Not specified

References

ReferenceSourceLinkTags
github.com/plone/plone.app.textfield/security/advisories/GHSA-4r4f-gg25-... [email protected] github.com
github.com/plone/plone.app.textfield/commit/467638e500d804c637031387a227... [email protected] github.com
github.com/plone/plone.app.textfield/commit/0da1aeec2406cf640977eb857a03... [email protected] github.com
github.com/plone/plone.app.textfield/commit/781d517a38524087fe57525a9480... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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