CVE-2026-77188 — Waitlist Woocommerce ( Back in stock notifier ) <= 2.9.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'type' Shortcode Attribute
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.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Technical severity (medium)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Xootix Waitlist Woocommerce ( Back in stock notifier )).
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Search available logs for exploit probes matching the vulnerability class (cross-site scripting), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Xootix | Waitlist Woocommerce ( Back in stock notifier ) | ≤ 2.9.1 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 6.4 | CVSS 3.1 | Medium | 3.1 | 2.7 | security@wordfence.com via NIST National Vulnerability Database |
| 6.4 | CVSS 3.1 | Medium | — | — | GitHub, Inc. via GitHub Security Advisories |
| 6.4 | CVSS 3.1 | Medium | — | — | Wordfence via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N (score shown at the top: security@wordfence.com) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Monitor CSP violation reports and script payloads in reflected parameters.
Timeline
What happened to this CVE, newest first.
- 2026
- Source status changed · Received → Deferred
- Source status changed · Published → Received
- Record published
- CVSS changed · 6.4
- Source status changed · → Published
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× References added · Oct 28, 2026 – Oct 28, 2026
- 1× Official description updated · Oct 28, 2026 – Oct 28, 2026
References
7 on the record
- plugins.trac.wordpress.org/browser/waitlist-woocommerce/tags/2.9.0/includes/xoo-wl-functions.php
- plugins.trac.wordpress.org/changeset/3765571/waitlist-woocommerce/trunk/includes/xoo-wl-function
- github.com/advisories/GHSA-9v87-xmhx-x7mr
- plugins.trac.wordpress.org/browser/waitlist-woocommerce/tags/2.9.0/includes/xoo-wl-functions.php
- www.wordfence.com/threat-intel/vulnerabilities/id/41348b65-97d7-467f-801f-a168eb366bba
- plugins.trac.wordpress.org/browser/waitlist-woocommerce/tags/2.9.0/includes/xoo-wl-functions.php
- nvd.nist.gov/vuln/detail/CVE-2026-77188
Elsewhere on this site
Related CVEs (same products)
- Medium CVE-2026-114701 WordPress Waitlist Woocommerce ( Back in stock notifier ) plugin <= 2.9.1 - Cross Site Scripting (XSS) vulnerability 6d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No FIRST EPSS score.
- No fixed version, patch or mitigation documented.
- No CISA SSVC assessment.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-77188 is "Waitlist Woocommerce ( Back in stock notifier ) <= 2.9.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'type' Shortcode Attribute", rated Medium. It affects Waitlist Woocommerce ( Back in stock notifier ) (Xootix); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.4 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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