CVE-2026-28560: Gvectors Wpforo Forum

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

wpForo Forum 2.4.14 contains a stored cross-site scripting vulnerability that allows script injection via forum URL data output into an inline script block using json_encode without the JSON_HEX_TAG flag. Attackers set a forum slug containing a closing script tag or unescaped single quote to break out of the JavaScript string context and execute arbitrary script in all visitors' browsers.

Affected products

• Gvectors Wpforo Forum: from 2.4.0, before 2.4.16 (fixed in 2.4.16)

Published 2026-02-28. Last modified 2026-06-17.