CVE-2023-3407: The Subscribe2 plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 10.40. This is due to missing or inc...

Description

The Subscribe2 plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 10.40. This is due to missing or incorrect nonce validation when sending test emails. This makes it possible for unauthenticated attackers to send test emails with custom content to users on sites running a vulnerable version of this plugin via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.25%

16.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Subscribe2 Project	Subscribe2	<= 10.40

References

Timeline

Published: Jun 28, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-3407?

The Subscribe2 plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 10.40. This is due to missing or incorrect nonce validation when sending test emails. This makes it possible for unauthenticated attackers to send test emails with custom content to users on sites running a vulnerable version of this plugin via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

How severe is CVE-2023-3407?

CVE-2023-3407 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.25% probability of exploitation in the next 30 days.

How do I fix CVE-2023-3407?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.