# CVE-2026-5820

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

## Description

The Zypento Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Table of Contents block in all versions up to, and including, 1.0.6. This is due to the front-end TOC rendering script reading heading text via `innerText` and inserting it into the page using `innerHTML` without proper sanitization. This makes it possible for authenticated attackers, with Author-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-2026-5820
- **Published:** 2026-04-22
- **CVSS severity:** MEDIUM
- **CVSS base score:** 6.4
- **CWE codes:** CWE-79

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5820

## Citation

> AI Analytics. CVE-2026-5820. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-5820. Derived from NIST NVD. Licensed CC0.

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