CVE-2026-81898
Concrete CMS below version 9.5.3 is vulnerable to Stored XSS via country-less Address attribute in Express association views
- State
- Published
- Severity
- 7.5 High
- Published
- Sep 15, 2026
- Updated
- Sep 20, 2026
- Reserved
- Aug 27, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.5 High | 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 | ConcreteCMS |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation
Affected Products
| Product | Versions |
|---|---|
Concrete CMSConcrete CMS |
|
References
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