Vulnerability in fullworks Quick PayPal Payments: Payment Button & Form

[ Description ]Official description

The Quick PayPal Payments: Payment Button & Form plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'form' parameter in all versions up to, and including, 6.0.4 due to insufficient input sanitization and output escaping. 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. Because wp_kses_post strips only HTML tags, a quote-breaking payload containing no angle brackets survives post save intact, and the injected script fires for every viewer of the post — including higher-privileged Editors and Administrators who routinely preview a Contributor's pending content.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• plugins.trac.wordpress.org/browser/quick-paypal-payments/tags/6.0.4/legacy/quick-paypal…
• plugins.trac.wordpress.org/browser/quick-paypal-payments/tags/6.0.4/legacy/quick-paypal…
• plugins.trac.wordpress.org/browser/quick-paypal-payments/tags/6.0.4/legacy/quick-paypal…
• plugins.trac.wordpress.org/browser/quick-paypal-payments/tags/6.0.4/legacy/quick-paypal…
• plugins.trac.wordpress.org/changeset/3746507
• plugins.trac.wordpress.org/changeset/3746507/quick-paypal-payments/trunk/legacy/quick-p…
• www.wordfence.com/threat-intel/vulnerabilities/id/203f850e-1eed-4c49-b733-4ac2ce9b6772