Bookero.pl WordPress Plugin Stored Cross-Site Scripting Vulnerability
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.
Browse WordPress security risksQuick answer
Bookero.pl - system rezerwacji online should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Bookero.pl - system rezerwacji online up to and including 2.2
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
Bookero.pl is affected by CVE-2026-6910. Vulnerable versions up to 2.2 allow stored cross-site scripting because shortcode attributes are concatenated into inline JavaScript without sufficient escaping. Patch and clean stored content that may contain script payloads.
- Inventory WordPress sites using Bookero.pl.
- Update Bookero.pl beyond 2.2 when a fixed release is available.
- Temporarily restrict contributor/subscriber content submission if patching is delayed.
- Review plugin fields, shortcode attributes, profile links, and stored records for injected script payloads.
- Remove malicious content and purge page, object, and CDN caches.
- Apply a Content Security Policy where compatible to reduce XSS impact.
- Review administrator sessions if privileged users viewed affected pages.
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Verify the fix
- Confirm Bookero.pl is no longer version 2.2 or older.
- Submit harmless script-like input in staging and confirm it is rejected or escaped.
- Open affected pages and confirm no stored script executes.
- Review rendered HTML for unsafe inline script injection from user-controlled values.
- Run a Fixnx scan and verify public WordPress exposure after cleanup.
Related categories
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Trusted references
FAQ
What is affected by CVE-2026-6910?
Bookero.pl - system rezerwacji online versions listed as affected should be reviewed: Bookero.pl - system rezerwacji online up to and including 2.2.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.