CVE-2024-8680

MailChimp for Wordpress <= 4.9.16 - Authenticated (Administrator+) Stored Cross-Site Scripting

2024-09-20 20:24

Strategic Overview

Status: Patched in 4.9.17
Affected Plugin: MC4WP: Mailchimp for WordPress
Affected Version: <= 4.9.16
CVSS: 4.4Medium
Weakness type: CWE-80 · Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CVE: CVE-2024-8680

View all MC4WP: Mailchimp for WordPress vulnerabilities

At a glance

CVE-2024-8680 is a medium-severity Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in the MC4WP WordPress plugin, affecting versions <= 4.9.16. It carries a CVSS score of 4.4 (reachable over the network). Exploitation requires an authenticated account at Administrator level or above. The issue is fixed in version 4.9.17; sites on affected versions should update now. Disclosed September 2024, reported by Jorge Diaz (ddiax).

Vulnerability Overview

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 4.9.16 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.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, and no interaction from a victim user.

CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as <, >, and & that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.

Remediation

Update to version 4.9.17, or a newer patched version

How does WordSec protect against this?

An attacker needs Administrator 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: MC4WP 4.9.17 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2024-8680 https://www.wordfence.com/threat-intel/vulnerabilities/id/aa464547-0380-4b91-a5ea-0cd9a66da7a7 https://nvd.nist.gov/vuln/detail/CVE-2024-8680

Related records

Other vulnerabilities in MC4WP: Mailchimp for WordPress

CVSS Vector

4.4

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

Base

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

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