What the vulnerability does
01Description
The PostmarkApp Email Integrator plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin settings in versions up to, and including, 2.4. This is due to insufficient input sanitization and output escaping on the pma_api_key and pma_sender_address parameters. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the settings page.
Explanation of Vulnerability in Simple Terms
02Summary
PostmarkApp Email Integrator versions 2.4 and earlier contain a cross-site scripting (XSS) vulnerability. An authenticated administrator with high privileges can inject malicious scripts that affect other users or components of the site. The vulnerability requires specific conditions to exploit and has limited impact on confidentiality and integrity.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers or affect site functionality.
Potential impact on your site
04Site Impact
An admin account could be compromised to inject scripts affecting other admins or site visitors.
Conditions required to exploit
05Prerequisites
Attacker must be an authenticated administrator with high privileges; no user interaction required.
Key dates
06Disclosure timeline
February 19, 2026
CVE published
April 8, 2026
Record updated
