---
id: CVE-2026-81898
title: >-
  In Concrete CMS below version 9.5.3, the Address attribute's country-less text
  formatter skipped HTML-escaping, enabling stored XSS in Express association
  views
summary: >-
  In Concrete CMS below version 9.5.3, the Address attribute's country-less text
  formatter skipped HTML-escaping, enabling stored XSS in Express association
  views. A user able to submit an Address attribute could execute script in the
  sess…
severity: high
cvss: 7.5
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-79
vendor: Concrete CMS
product: Concrete CMS
affected:
  - concrete_cms >= 5.0.0 <= 9.5.2
published: '2026-09-15'
updated: '2026-09-20'
sourceUpdated: '2026-09-20T01:16:30.180'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81898'
references:
  - url: >-
      https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes
    label: ff5b8ace-8b95-4078-9743-eac1ca5451de
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-20T00:35:07.205082Z'
cvssSource: cna
epss: 0.00437
epssPercentile: 0.35415
ingestedAt: '2026-09-15T17:41:02.946Z'
---

## Overview

In Concrete CMS below version 9.5.3, the Address attribute's country-less text formatter skipped HTML-escaping, enabling stored XSS in Express association views. A user able to submit an Address attribute could execute script in the session of any dashboard user who opened the affected entry. The unescaped branch was reachable because a non-required Address attribute accepted a blank country, and because several Express association templates (for example concrete/elements/express/form/view/dashboard/association.php) echoed the association label mask without applying h(). The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.5 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai for reporting.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.