CVE-2025-26951: Covertnine c9 Blocks

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in covertnine C9 Blocks c9-blocks allows DOM-Based XSS.This issue affects C9 Blocks: from n/a through <= 1.7.7.

Affected products

• Covertnine c9 Blocks: up to and including 1.7.7

Published 2025-04-15. Last modified 2026-06-17.