CVE-2026-77188 Details
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.
A stored cross-site scripting vulnerability has been identified in the Waitlist Woocommerce (Back in Stock Notifier) plugin for WordPress, affecting all versions through 2.9.1. The issue arises from inadequate input sanitization and output escaping, allowing authenticated attackers with contributor-level access or higher to inject arbitrary scripts into pages. These scripts execute when a user accesses the affected page. The vulnerability exists because the 'type' shortcode attribute values are not treated as HTML and bypass the wp_kses_post filter, with the injected payload only being executed when the shortcode is rendered.
Users are advised to update the Waitlist Woocommerce (Back in Stock Notifier) plugin to version 2.9.2 or a newer patched version.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 28, 2026CISA-ADP
Assessed Oct 29, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Waitlist Woocommerce | <= 2.9.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 29, 2026 | CVE Modified | CISA-ADP |
| Oct 28, 2026 | New CVE Received | [email protected] |