CVE-2026-6910

Description

The Bookero.pl – system rezerwacji online plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `bookero_products` shortcode's `hide_products` (and `filter_products`) attributes in versions up to and including 2.2. This is due to insufficient input sanitization and output escaping in the `bookero_products()` function — the raw attribute value is concatenated directly into an inline `<script>` block without any escaping. This makes it possible for authenticated attackers with contributor-level access and above to inject arbitrary web scripts into pages that will execute whenever a user accesses the injected page.

References

• https://plugins.trac.wordpress.org/browser/bookeropl/tags/2.1/libraries/bookero-front.php#L173
• https://plugins.trac.wordpress.org/browser/bookeropl/tags/2.1/libraries/bookero-front.php#L174
• https://plugins.trac.wordpress.org/browser/bookeropl/trunk/libraries/bookero-front.php#L173
• https://plugins.trac.wordpress.org/browser/bookeropl/trunk/libraries/bookero-front.php#L174
• https://plugins.trac.wordpress.org/changeset?reponame=&old=3524452%40bookeropl&new=3524452%40bookeropl