CVE-2026-81903
Concrete CMS 9.0.0 to 9.5.2 is vulnerable to Stored XSS via Page Container icon
Concrete CMS versions 9.0.0 to 9.5.2 stored the Page Container icon value submitted through the dashboard without validating it against the set of known container icons. The unvalidated value was later concatenated into the src attribute of an img tag by a helper that did not encode attribute output, and was rendered raw in the Containers dashboard list and editor views. A user with delegated access to the Page Containers dashboard could store a crafted icon value that broke out of the src attribute and executed script in the authenticated session of another editor or administrator who viewed the list, enabling session token theft and privileged dashboard actions. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.0 with vector CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Andrew Gonzalez for reporting.
| CWE | CWE-79 |
| Vendor | concrete cms |
| Product | concrete cms |
| Published | Sep 14, 2026 |
| Last Updated | Sep 15, 2026 |
Get instant alerts for concrete cms concrete cms
Be the first to know when new unknown vulnerabilities affecting concrete cms concrete cms are published — delivered to Slack, Telegram or Discord.