CVE-2023-6591

Popup Box Business (7.0.0 - 7.9.0) and Developer (20.0.0 - 20.9.0) - Authenticated (Admin+) Stored Cross-Site Scripting

2024-01-22 00:00

Strategic Overview

Status: Patched in 20.9.0
Affected Plugin: Popup Box (Developer) – Create Countdown, Coupon, Video, Contact Form Popups
Affected Version: 20.0.0 – < 20.9.0
CVSS: 6.6Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2023-6591

View all Popup Box (Developer) – Create Countdown, Coupon, Video, Contact Form Popups vulnerabilities

At a glance

CVE-2023-6591 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Popup Box (Developer) WordPress plugin, affecting versions 20.0.0 – < 20.9.0. It carries a CVSS score of 6.6 (reachable over the network; high integrity impact). Exploitation requires an authenticated account at Admin level or above. The issue is fixed in version 20.9.0; sites on affected versions should update now. Disclosed January 2024, reported by John Jefferson Li.

Vulnerability Overview

The Popup Box Business and Developer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in versions 20.0.0 to 20.9.0 (Developer) and versions 7.0.0 to 7.9.0 (Business) due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled. Please note this affects the premium version of the plugin despite the shared slug.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, and no interaction from a victim user. A successful exploit has high impact on integrity.

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

Reaching this weakness in Popup Box (Developer) 20.0.0 – < 20.9.0 takes an account at Admin level or above. 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 Popup Box (Developer) the fix is 20.9.0: builds 20.0.0 – < 20.9.0 are affected, anything from 20.9.0 onward is not.

Remediation

Update to version 20.9.0, or a newer patched version

How does WordSec protect against this?

An attacker needs Admin access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Popup Box (Developer) 20.9.0 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-6591 https://www.wordfence.com/threat-intel/vulnerabilities/id/27a36e90-9678-4832-9f37-b54fe75f5571 https://nvd.nist.gov/vuln/detail/CVE-2023-6591

Related records

Same weakness class

Other vulnerabilities in Popup Box (Developer) – Create Countdown, Coupon, Video, Contact Form Popups

CVSS Vector

6.6

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

Base

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredHigh
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityHigh
AvailabilityNone

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