CVE-2020-17451: Flatcore

Medium severity, CVSS 4.8. EPSS: 0.6% chance of exploitation in the next 30 days.

flatCore before 1.5.7 allows XSS by an admin via the acp/acp.php?tn=pages&sub=edit&editpage=1 page_linkname, page_title, page_content, or page_extracontent parameter, or the acp/acp.php?tn=system&sub=sys_pref prefs_pagename, prefs_pagetitle, or prefs_pagesubtitle parameter.

Affected products

• Flatcore Flatcore: before 1.5.7 (fixed in 1.5.7)

Published 2020-08-09. Last modified 2026-06-17.