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Blocksy vulnerabilities
Blocksy has 8 known vulnerabilities in this database. The most recent published record is dated 9 Jun 2026.
- Known vulnerabilities
- 8
- Active installs
- 300,000+
- Latest version
- 2.1.57
- Last updated
- 11 Sep 2026
- Most recent
- 9 Jun 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 |
|---|---|---|---|---|
| Remote code execution CVE-2026-8365 | High 8.8 | Up to 2.1.35 | Fixed in a later version (latest 2.1.57) | 9 Jun 2026 |
| Cross-site scripting (XSS) CVE-2026-2583 | Medium 6.4 | Up to 2.1.30 | Fixed in a later version (latest 2.1.57) | 2 Mar 2026 |
| Cross-site scripting (XSS) CVE-2024-11420 | Medium 6.4 | Before 2.0.78 | Fixed in 2.0.78 | 5 Dec 2024 |
| Cross-site scripting (XSS) CVE-2024-5439 | Medium 6.4 | Before 2.0.51 | Fixed in 2.0.51 | 5 Jun 2024 |
| Cross-site scripting (XSS) CVE-2024-4943 | Medium 6.4 | Before 2.0.47 | Fixed in 2.0.47 | 21 May 2024 |
| Cross-site scripting (XSS) CVE-2024-4158 | Medium 6.4 | Before 2.0.43 | Fixed in 2.0.43 | 14 May 2024 |
| Cross-site scripting (XSS) CVE-2024-3747 | Medium 6.4 | Before 2.0.40 | Fixed in 2.0.40 | 2 May 2024 |
| Cross-site scripting (XSS) CVE-2024-1767 | Medium 6.4 | Before 2.0.27 | Fixed in 2.0.27 | 9 Mar 2024 |
Read the published descriptions
- CVE-2026-8365, 9 Jun 2026
- The Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the 'blocksy_meta' REST API field and the V200 database migration in versions up to and including 2.1.35. This is due to insufficient input sanitization in the blocksy_sanitize_post_meta_options() function, which only blocks values containing '<' or '>' and does not prevent serialized PHP object strings from being stored in post meta, combined with the SearchReplacer::run_recursively() function unconditionally deserializing all string values via @unserialize() during migration without restricting allowed classes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject a serialized Blocksy\RaiiPattern object into post meta that, when the V200 migration runs on an upgraded site, is deserialized and triggers RaiiPattern::__destruct(), which executes arbitrary PHP callables via call_user_func(). CVE record
- CVE-2026-2583, 2 Mar 2026
- The Blocksy theme for WordPress is vulnerable to Stored Cross-Site Scripting via the `blocksy_meta` metadata fields in all versions up to, and including, 2.1.30 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-2024-11420, 5 Dec 2024
- The Blocksy theme for WordPress is vulnerable to Stored Cross-Site Scripting via the Contact Info Block link parameter in all versions up to, and including, 2.0.77 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-2024-5439, 5 Jun 2024
- The Blocksy theme for WordPress is vulnerable to Reflected Cross-Site Scripting via the custom_url parameter in all versions up to, and including, 2.0.50 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. CVE record
- CVE-2024-4943, 21 May 2024
- The Blocksy theme for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘has_field_link_rel’ parameter in all versions up to, and including, 2.0.46 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-2024-4158, 14 May 2024
- The Blocksy theme for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘tagName’ parameter in versions up to, and including, 2.0.42 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. CVE record
- CVE-2024-3747, 2 May 2024
- The Blocksy theme for WordPress is vulnerable to Stored Cross-Site Scripting via the className parameter in the About Me block in all versions up to, and including, 2.0.39 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. CVE record
- CVE-2024-1767, 9 Mar 2024
- The Blocksy theme for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's blocks in all versions up to, and including, 2.0.26 due to insufficient input sanitization and output escaping on user supplied attributes like 'className' and 'radius'. This makes it possible for authenticated attackers with contributor-level and above permissions 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 Blocksy
If you run Blocksy, 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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