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8.8 High

CVE-2026-8365 The Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the…

Description

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().

Affected products and versions

Product Affected versions Fixed in
Blocksy 2.1 earliest → 2.1.41 No fix stated

Other CVEs of Blocksy

The 14 CVEs of Blocksy →
CVE-2026-2583 The Blocksy theme for WordPress is vulnerable to Stored Cross-Site Scripting via the `blocksy_meta` metadata fields in… 6.4 Medium CVE-2025-55713 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in creativethemeshq… 5.9 Medium CVE-2025-47465 Missing Authorization vulnerability in creativethemeshq Blocksy blocksy allows Exploiting Incorrectly Configured… 4.9 Medium CVE-2024-37469 Cross-Site Request Forgery (CSRF) vulnerability in creativethemeshq Blocksy blocksy allows Cross Site Request… 5.4 Medium
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