CVE-2026-1043: GAGAN0123 Postmarkapp Email Integrator

Medium severity, CVSS 4.4. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• GAGAN0123 Postmarkapp Email Integrator: up to and including 2.4

Published 2026-02-19. Last modified 2026-06-17.