wpmkorg WPMK Block Plugin up to 1.0.1 on WordPress Shortcode wpmk_block_shortcode cross site scripting

Summaryinfo

A vulnerability was found in wpmkorg WPMK Block Plugin up to 1.0.1 on WordPress. It has been rated as problematic. This issue affects the function wpmk_block_shortcode of the component Shortcode Handler. This manipulation causes cross site scripting. This vulnerability appears as CVE-2026-4125. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in wpmkorg WPMK Block Plugin up to 1.0.1 on WordPress. Affected by this vulnerability is the function wpmk_block_shortcode of the component Shortcode Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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.

The weakness was presented by zakaria. The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-4125 since 03/13/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 1.0.1 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• wpmkorg

Name

• WPMK Block Plugin

Version

• 1.0.0
• 1.0.1

CPE 2.3info

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• 🔒

CPE 2.2info

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