CVE-2026-81898

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.

• CWE-79

• https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes

Published

Sep 15, 2026

Last Modified

Sep 20, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-81892EasyAdmin is a fast and modern admin generator for Symfony a…8.1
• CVE-2026-81893A flaw was found in gdk-pixbuf. When loading a specially cra…4.7
• CVE-2026-81894Concrete CMS 9.5.2 and below is vulnerable to stored DOM-bas…5.4
• CVE-2026-81895In Concrete CMS before 9.5.3, the Document Library block sto…7.2
• CVE-2026-81896Concrete CMS before 9.5.3 does not apply HTML entity encodin…5.4
• CVE-2026-81897In Concrete CMS below CMS 9.5.3, the save_control action in …5.4
• CVE-2026-81899Concrete CMS 9.0.0 to 9.5.2 stored group folder names withou…7.3
• CVE-2026-8190A vulnerability was determined in Wavlink NU516U1 M16U1_V240…8.8
• CVE-2026-81900Concrete CMS before 9.5.3 applied only trim() to the YouTube…6.1
• CVE-2026-81901In Concrete CMS 9.2.0 through 9.5.2, the REST API page updat…8.7
• CVE-2026-81902Concrete CMS 9 through 9.5.2 did not validate a CSRF token i…8.1
• CVE-2026-81903Concrete CMS versions 9.0.0 to 9.5.2 stored the Page Contain…5.4