Blocksy

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().

Published: 2026-06-09T08:29:40.638Z
Updated: 2026-06-09T12:56:15.813Z

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.

Published: 2026-03-02T22:23:39.951Z
Updated: 2026-04-08T17:24:26.380Z

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in creativethemeshq Blocksy blocksy allows Stored XSS.This issue affects Blocksy: from n/a through <= 2.1.6.

Published: 2025-08-14T18:21:25.460Z
Updated: 2026-04-28T16:13:37.517Z

Missing Authorization vulnerability in creativethemeshq Blocksy blocksy allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Blocksy: from n/a through <= 2.0.97.

Published: 2025-05-07T14:19:41.065Z
Updated: 2026-04-28T16:12:42.018Z

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.

Published: 2024-06-05T07:34:56.901Z
Updated: 2026-04-08T17:19:37.421Z