CVE-2026-54503Network attack vectorHinoki check available

Stored XSS via safe-HTML equality shortcut

Published Sep 15, 2026 · Updated Sep 15, 2026

Stored XSS in Plone plone.app.textfield before 2.0.2, 3.0.0 through 3.0.1, and 4.0.0 allows remote authenticated users to run JavaScript. RichTextValue.output returns raw stored content when mimeType equals outputMimeType, so text/x-html-safe input bypasses safe_html and reaches tal:content=structure without escaping. An account able to set a RichText field can persist script that executes when the field is viewed, exposing browser-accessible data in that viewer's session.

CVSS severity4.3
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in Plone plone.app.textfield before 2.0.2, 3.0.0 through 3.0.1, and 4.0.0 allows remote authenticated users to run JavaScript. RichTextValue.output returns raw stored content when mimeType equals outputMimeType, so text/x-html-safe input bypasses safe_html and reaches tal:content=structure without escaping. An account able to set a RichText field can persist script that executes when the field is viewed, exposing browser-accessible data in that viewer's session.

The record

CVE
CVE-2026-54503
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Plone
Product
plone.app.textfield
Classifications
CWE-80, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.0.2
  2. Affected versionversion=>= 3.0.0, < 3.0.2
  3. Affected versionversion=>= 4.0.0, < 4.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Plone · plone.app.textfieldversion=< 2.0.2; version=>= 3.0.0, < 3.0.2; version=>= 4.0.0, < 4.0.1

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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