CVE-2026-71249
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
The public contact form plugin 299Ko's public contact form does not sanitize POST fields (name, firstname, email, message) before placing them into the page template. The template engine's variable output function does not use htmlspecialchars, and the contact.tpl template outputs values unescaped into an HTML attribute and a textarea.
Risk Assessment
An attacker can inject malicious HTML or JavaScript, leading to XSS attacks on users visiting the contact form page, data theft, or session hijacking.
Recommendation
Update the plugin to a version that includes input sanitization fixes. If not possible, apply escaping to all output in templates and implement server-side validation.
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Original NVD description (English source)
299Ko's public contact form (plugin/contact/controllers/ContactController.php, home) sets raw POST field values (name, firstname, email, message) into the page template with no sanitization. The template engine's variable output function (common/Template.php, _show_var) echoes values with no htmlspecialchars call, and the sink template (contact.tpl) outputs these values unescaped into an HTML attribute and a textarea.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

