CVE-2026-54503
plone.app.textfield: Stored XSS by spoofing mime type
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| NVDNVD · Awaiting Analysis | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.40% · top 66% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Weakness
Affected products
- affected < 2.0.2
- affected >= 3.0.0, < 3.0.2
- affected >= 4.0.0, < 4.0.1
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- PyPIplone.app.textfieldGHSA-4r4f-gg25-rmg5 (opens in a new tab)
References (4)
- https://github.com/plone/plone.app.textfield/security/advisories/GHSA-4r4f-gg25-rmg5 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/plone/plone.app.textfield/commit/0da1aeec2406cf640977eb857a03e792d2c7cac2 (opens in a new tab)x_refsource_MISC
- https://github.com/plone/plone.app.textfield/commit/467638e500d804c637031387a227a2b02d12a86f (opens in a new tab)x_refsource_MISC
- https://github.com/plone/plone.app.textfield/commit/781d517a38524087fe57525a94806684908f852f (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-4r4f-gg25-rmg5 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-54503)Record last updated .