WPForms Pro Plugin up to 2.0.0.2 on WordPress Input Sanitization view-entry.min.js wp_kses_allowed_html data-src cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in WPForms Pro Plugin up to 2.0.0.2. This affects the function wp_kses_allowed_html of the file view-entry.min.js of the component Input Sanitization. Such manipulation of the argument data-src leads to cross site scripting. This vulnerability is listed as CVE-2026-18409. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in WPForms Pro Plugin up to 2.0.0.2. It has been rated as problematic. Affected by this issue is the function wp_kses_allowed_html of the file view-entry.min.js of the component Input Sanitization. The manipulation of the argument data-src with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

The WPForms Pro plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Single Line Text and Paragraph Text Field Values in all versions up to, and including, 2.0.0.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit relies on the plugin's own wp_kses_allowed_html filter widening the 'post' allowlist to permit iframe elements with a data-src attribute, which is not on WordPress's URI-attribute sanitization list, allowing a javascript: URI stored in data-src to survive kses processing and subsequently be promoted to a live src attribute by the bundled admin script view-entry.min.js.

The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-18409 since 07/30/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• WPForms

Name

• Pro Plugin

Version

• 2.0.0.0
• 2.0.0.1
• 2.0.0.2

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion