---
id: CVE-2026-81896
title: >-
  Concrete CMS before 9.5.3 does not apply HTML entity encoding to user-defined
  Form block question labels when rendering them as column headers in the
  Dashboard Form Submissions report
  (concrete/single_pages/dashboard/reports/forms/legacy…
summary: >-
  Concrete CMS before 9.5.3 does not apply HTML entity encoding to user-defined
  Form block question labels when rendering them as column headers in the
  Dashboard Form Submissions report
  (concrete/single_pages/dashboard/reports/forms/legacy…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: concretecms
product: concrete_cms
affected:
  - concrete_cms < 9.5.3
patched:
  - concrete_cms 9.5.3
published: '2026-09-15'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:16:52.643'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81896'
references:
  - url: >-
      https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes
    label: ff5b8ace-8b95-4078-9743-eac1ca5451de
tags:
  - nvd
  - cve.org
  - score-dispute
epss: 0.00237
epssPercentile: 0.13253
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-22T18:11:48.678661Z'
scores:
  nvd: 5.4
  cna: 8.4
ingestedAt: '2026-09-15T17:41:02.866Z'
---

## Overview

Concrete CMS before 9.5.3 does not apply HTML entity encoding to user-defined Form block question labels when rendering them as column headers in the Dashboard Form Submissions report (concrete/single_pages/dashboard/reports/forms/legacy.php). a rogue editor could store markup or script in a label that then executes in the browser of any administrator who opens the submissions report for the affected form, producing stored cross-site scripting in the Dashboard. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 8.4 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai for reporting.

## Affected

- `concrete_cms < 9.5.3`

## Remediation

Upgrade past the affected range:

- `concrete_cms 9.5.3`