# CVE-2026-0894

> Vulnerability · severity: **MEDIUM** (CVSS 6.4).

## 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.

## Key facts

- **CVE ID:** CVE-2026-0894
- **Published:** 2026-04-18
- **CVSS severity:** MEDIUM
- **CVSS base score:** 6.4
- **CWE codes:** CWE-79

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-0894

## Citation

> AI Analytics. CVE-2026-0894. Retrieved 2026-07-18 from https://api.ai-analytics.org/cve/CVE-2026-0894. Derived from NIST NVD. Licensed CC0.

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