CVE-2026-13440

StoreGrowth: Smart Sales Booster for WooCommerce | BOGO, Upsells, Direct Checkout, Quick View, Side Cart <= 2.1.0 - Unauthenticated Stored Cross-Site Scripting via 'message_popup' Parameter

2026-07-27 23:27

Strategic Overview

Status: Patched in 2.1.1
Affected Plugin: StoreGrowth – Upsell, BOGO, Quick View, Direct Checkout & Side Cart for WooCommerce
Affected Version: <= 2.1.0
CVSS: 7.2High
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2026-13440

View all StoreGrowth – Upsell, BOGO, Quick View, Direct Checkout & Side Cart for WooCommerce vulnerabilities

At a glance

CVE-2026-13440 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the StoreGrowth WordPress plugin, affecting versions <= 2.1.0. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.1.1; sites on affected versions should update now. Disclosed July 2026, reported by Chawabhon Netisingha (JNX03).

Vulnerability Overview

The StoreGrowth: Smart Sales Booster for WooCommerce | BOGO, Upsells, Direct Checkout, Quick View, Side Cart plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'message_popup' parameter in all versions up to, and including, 2.1.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit is possible because the 'ajd_protected' nonce required by the create_popup handler is exposed to all unauthenticated frontend visitors via wp_localize_script under bogo_save_url.ajd_nonce, effectively bypassing the nonce-only access control.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

StoreGrowth <= 2.1.0 carries this weakness at message_popup, and reaching it takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For StoreGrowth the fix is 2.1.1: builds <= 2.1.0 are affected, anything from 2.1.1 onward is not.

Remediation

Update to version 2.1.1, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: StoreGrowth 2.1.1 closes this, and updating the plugin is the step that ends it.

Firewall
Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-13440 https://www.wordfence.com/threat-intel/vulnerabilities/id/79d4d776-411e-45ec-aff7-23453e686bf2 https://nvd.nist.gov/vuln/detail/CVE-2026-13440

Related records

Other vulnerabilities in StoreGrowth – Upsell, BOGO, Quick View, Direct Checkout & Side Cart for WooCommerce

CVSS Vector

7.2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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