What’s Vulnerable › Vulnerabilities

CVE-2023-6527: Email Subscription Popup <= 1.2.18 - Reflected Cross-Site Scripting

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-12-06 · updated 2026-06-17
• Weakness: CWE-79

Description

The Email Subscription Popup plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the HTTP_REFERER header in all versions up to, and including, 1.2.18 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Affected products

• nik00726 Email Subscription Popup: before 1.2.19 — fixed in 1.2.19

How to fix

Upgrade to a fixed version: nik00726 Email Subscription Popup 1.2.19. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/browser/email-subscribe/tags/1.2.19/wp-email-subscription.php?rev=3005188#L2125
• https://www.wordfence.com/threat-intel/vulnerabilities/id/5f84814e-f7b7-4228-b331-63027a0770af?source=cve
• https://plugins.trac.wordpress.org/browser/email-subscribe/tags/1.2.19/wp-email-subscription.php?rev=3005188#L2125
• https://www.wordfence.com/threat-intel/vulnerabilities/id/5f84814e-f7b7-4228-b331-63027a0770af?source=cve

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