CVE-2026-12801 describes a stored cross-site scripting vulnerability in the Ultra Addons for Contact Form 7 plugin for WordPress. The issue arises from insufficient input sanitization and output escaping of the 'data-label' and 'data-separator' attributes in the Range Slider component. Authenticated attackers with contributor-level privileges or higher can exploit this flaw to inject arbitrary web scripts that execute in the context of users viewing the compromised pages. This vulnerability affects all versions up to and including 3.5.43. No vendor advisory or patch information is currently provided.

Successful exploitation allows authenticated users with contributor or higher privileges to inject malicious scripts that execute in the browsers of users who access the affected pages. This can lead to information disclosure and integrity impacts within the affected WordPress environment. There is no indication of availability impact. The vulnerability requires authentication and does not require user interaction beyond viewing the injected page.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict contributor-level access to trusted users only and consider disabling or limiting use of the Range Slider feature in the plugin to reduce exposure.