# CVE-2026-4125

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

## Description

The WPMK Block plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'class' shortcode attribute in all versions up to and including 1.0.1. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes. Specifically, in the wpmk_block_shortcode() function, the 'class' attribute is extracted from user-controllable shortcode attributes and directly concatenated into an HTML div element's class attribute without any escaping (e.g., esc_attr()). 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-2026-4125
- **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-2026-4125

## Citation

> AI Analytics. CVE-2026-4125. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-4125. Derived from NIST NVD. Licensed CC0.

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