CVE-2026-54503
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network with a low-privilege account. Limited direct impact.
- Exploit odds
- 0.4% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.4% in the next 30 days (EPSS).
- Severity: 4.3 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.4% · EPSS, next 30 days
- Weakness
- CWE-80
- Record status
- Awaiting Analysis
Attack profile CVSS 3.1 · 4.3
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-54503.md and follow it. Check whether this project is affected by CVE-2026-54503. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/plone/plone.app.textfield/commit/0da1aeec2406cf640977eb857a03e792d2c7cac2
- https://github.com/plone/plone.app.textfield/commit/467638e500d804c637031387a227a2b02d12a86f
- https://github.com/plone/plone.app.textfield/commit/781d517a38524087fe57525a94806684908f852f
- https://github.com/plone/plone.app.textfield/security/advisories/GHSA-4r4f-gg25-rmg5
References
- https://github.com/plone/plone.app.textfield/commit/0da1aeec2406cf640977eb857a03e792d2c7cac2
- https://github.com/plone/plone.app.textfield/commit/467638e500d804c637031387a227a2b02d12a86f
- https://github.com/plone/plone.app.textfield/commit/781d517a38524087fe57525a94806684908f852f
- https://github.com/plone/plone.app.textfield/security/advisories/GHSA-4r4f-gg25-rmg5