CVE-2026-81927 Concrete CMS before 9.5.3 is vulnerable to Stored XSS via SVG upload in "Reject" sanitization mode

Concrete CMS before 9.5.3 contained a stored cross-site scripting vulnerability in SVG file handling. When SVG processing was set to the non-default "Reject files containing potentially harmful elements" mode concrete.filemanager.images.svgsanitization.action = reject, uploaded SVGs were checked...

CVE-2026-81927

Concrete CMS before 9.5.3 contained a stored XSS vulnerability in its SVG file handling. The flaw is triggered only when SVG sanitization is set to the non-default "reject" mode (concrete.file_manager.images.svg_sanitization.action = reject). In that mode, uploaded SVGs were checked against a sma...