PostmarkApp Email Integrator <= 2.4 - Authenticated (Administrator+) Stored Cross-Site Scripting via Plugin Settings

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2026-1043
CVSS Medium (4.4)
Publicly Published February 18, 2026
Last Updated February 19, 2026
Researcher 0x34rth
Description

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.

References

1 affected software package

Software Type Plugin
Software Slug postmarkapp-email-integrator (view on wordpress.org)
Patched? No
Affected Version
  • <= 2.4
Patched Version
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