anssilaitila Contact List Plugin up to 3.0.18 on WordPress class-contact-list-custom-fields.php saveCustomFields _cl_map_iframe cross site scripting

Summaryinfo

A vulnerability has been found in anssilaitila Contact List Plugin up to 3.0.18 on WordPress and classified as problematic. This impacts the function saveCustomFields of the file class-contact-list-custom-fields.php. The manipulation of the argument _cl_map_iframe leads to cross site scripting. This vulnerability is traded as CVE-2026-3516. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in anssilaitila Contact List Plugin up to 3.0.18 on WordPress and classified as problematic. This issue affects the function saveCustomFields of the file class-contact-list-custom-fields.php. The manipulation of the argument _cl_map_iframe 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. The summary by CVE is:

The Contact List plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the '_cl_map_iframe' parameter in all versions up to, and including, 3.0.18. This is due to insufficient input sanitization and output escaping when handling the Google Maps iframe custom field. The saveCustomFields() function in class-contact-list-custom-fields.php uses a regex to extract <iframe> tags from user input but does not validate or sanitize the iframe's attributes, allowing event handlers like 'onload' to be included. The extracted iframe HTML is stored via update_post_meta() and later rendered on the front-end in class-cl-public-card.php without any escaping or wp_kses filtering. 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 shared by Tharadol Suksamran. The advisory is shared at wordfence.com. The identification of this vulnerability is CVE-2026-3516 since 03/04/2026. The exploitation is known to be easy. The attack may be initiated 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.

By approaching the search of inurl:class-contact-list-custom-fields.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 3.0.17 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• anssilaitila

Name

• Contact List Plugin

Version

• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4
• 3.0.5
• 3.0.6
• 3.0.7
• 3.0.8
• 3.0.9
• 3.0.10
• 3.0.11
• 3.0.12
• 3.0.13
• 3.0.14
• 3.0.15
• 3.0.16
• 3.0.17
• 3.0.18

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Threat Intelligenceinfo

Countermeasuresinfo

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Sourcesinfo

Entryinfo

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