CVE-2026-0894

Description

The Content Blocks (Custom Post Widget) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's content_block shortcode in all versions up to, and including, 3.3.9 due to insufficient input sanitization and output escaping on user supplied values consumed from user-created content blocks. 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 Reserved 2026-01-13 | Published 2026-04-18 | Updated 2026-04-20 | Assigner Wordfence

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Timeline

Credits

Muhammad Yudha - DJ finder

References

www.wordfence.com/...-82e0-4630-8d95-d2419e9eaef8?source=cve

plugins.trac.wordpress.org/...set/3447914/custom-post-widget

cve.org (CVE-2026-0894)

nvd.nist.gov (CVE-2026-0894)

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