CVE-2026-18119 Concrete CMS below 9.5.3 is vulnerable to Stored XSS via unsanitized inline block custom style values

Concrete CMS below 9.5.3 did not sanitize custom style values in the Block Design dialog before writing them into page CSS via a DOM sink, permitting stored cross-site scripting. An editor-level user could execute script in an administrator's session and escalate privileges. The Concrete CMS...