What is CVE-2025-15678?

CVE-2025-15678 is a medium-severity vulnerability in Nexter Blocks, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-06.

How severe is CVE-2025-15678?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Nexter Blocks

CVE-2025-15678

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (4.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Unknown Nexter Blocks — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2025-15678?: CVE-2025-15678 is a medium-severity vulnerability in Nexter Blocks, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-06.
How severe is CVE-2025-15678?: Medium severity. CVSS v3 base score is 6.1 out of 10.