CVE-2026-1043 PostmarkApp Email Integrator <= 2.4 - Authenticated (Administrator+) Stored Cross-Site Scripting via Plugin Settings
Authenticated administrators can inject arbitrary scripts into PostmarkApp Email Integrator settings, leading to potential account takeover or code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-1043?
CVE-2026-1043 is a medium-severity cross-site scripting vulnerability in gagan0123 PostmarkApp Email Integrator, published on 19 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-1043?
How do I fix CVE-2026-1043?
No fix has been published for CVE-2026-1043 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-1043 being exploited?
There is no known exploitation of CVE-2026-1043 in the wild and no public exploit code.
Sources
Also known as GHSA-8f6v-m94c-843c.