CVE-2026-8365 | BDVDB-2026-338732 Detail
creativethemeshqBlocksy
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().
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.
Weaknesses#
- CWE-502 Deserialization of Untrusted Data
References#
- https://www.wordfence.com/threat-intel/vulnerabilities/id/fd216743-ce8d-4632-9fd1-d63502c2dfcd?source=cve
- https://themes.trac.wordpress.org/browser/blocksy/trunk/inc/classes/db-versioning/utils/db-search-replacer.php#L98
- https://themes.trac.wordpress.org/browser/blocksy/2.1.41/inc/classes/db-versioning/utils/db-search-replacer.php#L98
- https://themes.trac.wordpress.org/browser/blocksy/trunk/admin/helpers/meta-boxes.php#L104
- https://themes.trac.wordpress.org/browser/blocksy/2.1.41/admin/helpers/meta-boxes.php#L104
- https://themes.trac.wordpress.org/browser/blocksy/trunk/admin/helpers/validator.php#L75
- https://themes.trac.wordpress.org/browser/blocksy/2.1.41/admin/helpers/validator.php#L75
- https://themes.trac.wordpress.org/browser/blocksy/trunk/inc/classes/raii.php#L12
- https://themes.trac.wordpress.org/browser/blocksy/2.1.41/inc/classes/raii.php#L12
- https://themes.trac.wordpress.org/browser/blocksy/2.1.35/inc/classes/db-versioning/utils/db-search-replacer.php#L98
- https://themes.trac.wordpress.org/browser/blocksy/2.1.35/admin/helpers/meta-boxes.php#L104
- https://themes.trac.wordpress.org/browser/blocksy/2.1.35/admin/helpers/validator.php#L75
- https://themes.trac.wordpress.org/browser/blocksy/2.1.35/inc/classes/raii.php#L12
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.