CVE-2026-77188 The Waitlist Woocommerce ( Back in stock notifier ) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'type' Shortcode A
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-77188?
CVE-2026-77188 is a medium-severity vulnerability in xootix Waitlist Woocommerce ( Back in stock notifier ), published on 28 Oct 2026.
Official description
The Waitlist Woocommerce ( Back in stock notifier ) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'type' Shortcode Attribute in all versions up to, and including, 2.9.1 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. The wp_kses_post filter applied on contributor post save does not prevent this vulnerability because shortcode attribute values are not HTML and pass through kses unchanged; the payload is materialized only at render time when the shortcode is expanded.
Weakness: CWE-79
Which versions are affected by CVE-2026-77188?
How do I fix CVE-2026-77188?
No fix has been published for CVE-2026-77188 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-77188 being exploited?
There is no known exploitation of CVE-2026-77188 in the wild and no public exploit code.
Sources
Also known as GHSA-9v87-xmhx-x7mr.