CVE-2026-77188
Waitlist Woocommerce ( Back in stock notifier ) <= 2.9.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'type' Shortcode Attribute
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.
INFO
Published Date :
Oct. 28, 2026, 7:16 a.m.
Last Modified :
Oct. 28, 2026, 7:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Waitlist Woocommerce plugin to the latest version.
- Verify input sanitization and output escaping for shortcode attributes.
- Ensure all user-supplied data is properly validated.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-77188.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-77188 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-77188
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-77188 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-77188 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
Oct. 28, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Added CWE CWE-79 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/77xxx/CVE-2026-77188.json">CVE-2026-77188</a> Added Reference https://plugins.trac.wordpress.org/browser/waitlist-woocommerce/tags/2.9.0/includes/xoo-wl-functions.php#L114 Added Reference https://plugins.trac.wordpress.org/browser/waitlist-woocommerce/tags/2.9.0/includes/xoo-wl-functions.php#L155 Added Reference https://plugins.trac.wordpress.org/browser/waitlist-woocommerce/tags/2.9.0/includes/xoo-wl-functions.php#L170 Added Reference https://plugins.trac.wordpress.org/changeset/3765571/waitlist-woocommerce/trunk/includes/xoo-wl-functions.php Added Reference https://www.wordfence.com/threat-intel/vulnerabilities/id/41348b65-97d7-467f-801f-a168eb366bba?source=cve