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Nexter Blocks vulnerabilities
Nexter Blocks has 5 known vulnerabilities in this database. The most recent published record is dated 9 Aug 2026.
- Known vulnerabilities
- 5
- Active installs
- 10,000+
- Latest version
- 5.0.7
- Last updated
- 23 Sep 2026
- Most recent
- 9 Aug 2026
Find it in your WordPress dashboard under Plugins. Severity is based on the CVSS score published with the CVE where one is available.
| Vulnerability | Severity | Affected | Fix | Published |
|---|---|---|---|---|
| Security weakness CVE-2026-17011 | Low 3.8 | Before 5.0.2 | Fixed in 5.0.2 | 9 Aug 2026 |
| Cross-site scripting (XSS) CVE-2025-15678 | Medium 6.1 | Before 5.0.2 | Fixed in 5.0.2 | 6 Aug 2026 |
| Path traversal CVE-2026-15420 | Medium 4.3 | Up to 5.0.0 | Fixed in a later version (latest 5.0.7) | 24 Jul 2026 |
| Cross-site scripting (XSS) CVE-2026-6740 | Medium 6.4 | Up to 4.7.4 | Fixed in a later version (latest 5.0.7) | 8 Jul 2026 |
| Cross-site scripting (XSS) CVE-2025-8567 | Medium 6.4 | Up to 4.5.4 | Fixed in a later version (latest 5.0.7) | 19 Aug 2025 |
Read the published descriptions
- CVE-2026-17011, 9 Aug 2026
- The Nexter Blocks WordPress plugin before 5.0.2 does not restrict who can save global CSS through one of its REST endpoints, allowing users with at least the Contributor role to store arbitrary CSS that is rendered site-wide on the front end, enabling defacement, content hiding, and UI redressing. CVE record
- CVE-2025-15678, 6 Aug 2026
- 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. CVE record
- CVE-2026-15420, 24 Jul 2026
- The Nexter Blocks - Gutenberg Blocks, Page Builder & AI Website Builder plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 5.0.0 via the 'plus_name' parameter. This makes it possible for authenticated attackers, with subscriber-level access and above, to delete arbitrary JS/CSS files on the server, which can lead to denial of service or destruction of critical plugin and theme assets. CVE record
- CVE-2026-6740, 8 Jul 2026
- The Nexter Blocks - Gutenberg Blocks, Page Builder & AI Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'commentIcon' parameter in all versions up to, and including, 4.7.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. CVE record
- CVE-2025-8567, 19 Aug 2025
- The Nexter Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple widgets in all versions up to, and including, 4.5.4 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. CVE record
What to do if you run Nexter Blocks
If you run Nexter Blocks, open WordPress and check the installed version in Plugins. Compare it with the affected versions in the vulnerability record. If a fixed version is available, take a current backup and update to that version or the latest supported release.
If no fixed version exists, consider disabling and removing the plugin or replacing it with a maintained alternative. After dealing with the affected software, check administrator users, unexpected file changes, redirects, unfamiliar pages and security logs for signs that the site may already have been altered.
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