CVE-2025-15678: Unknown Nexter Blocks

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

The Nexter Blocks WordPress plugin before 5.0.2 does not sanitize uploaded SVG files and allows SVG uploads for any user able to upload files (Author by default), allowing them to upload a file containing malicious JavaScript that executes when the file is accessed, leading to Stored Cross-Site Scripting.

Affected products

• Unknown Nexter Blocks: before 5.0.2 (fixed in 5.0.2)

Published 2026-08-06. Last modified 2026-09-29.