What is CVE-2026-1043?

CVE-2026-1043 is a medium-severity vulnerability in Gagan0123 Postmarkapp Email Integrator, classified under Cross-site Scripting. CVSS score: 4.4/10. Published 2026-02-19.

How severe is CVE-2026-1043?

Medium severity. CVSS v3 base score is 4.4 out of 10.

XSS in Gagan0123 Postmarkapp Email Integrator

CVE-2026-1043

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (15.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N.

Affected products

Gagan0123 Postmarkapp Email Integrator — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-1043?: CVE-2026-1043 is a medium-severity vulnerability in Gagan0123 Postmarkapp Email Integrator, classified under Cross-site Scripting. CVSS score: 4.4/10. Published 2026-02-19.
How severe is CVE-2026-1043?: Medium severity. CVSS v3 base score is 4.4 out of 10.