CVE-2026-54503plone.app.textfield: Stored XSS by spoofing mime type
Updated under an hour ago ()
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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 (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-80
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
plone plone.app.textfield plone:plone.app.textfield (from the name) | before 2.0.2; from 3.0.0, < 3.0.2; from 4.0.0, < 4.0.1 | CNA record |
References
- https://github.com/plone/plone.app.textfield/security/advisories/GHSA-4r4f-gg25-rmg5x-refsource-confirm
- https://github.com/plone/plone.app.textfield/commit/0da1aeec2406cf640977eb857a03e792d2c7cac2x-refsource-misc
- https://github.com/plone/plone.app.textfield/commit/467638e500d804c637031387a227a2b02d12a86fx-refsource-misc
- https://github.com/plone/plone.app.textfield/commit/781d517a38524087fe57525a94806684908f852fx-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.