CVE-2026-105061: WP Mailster cross-site scripting (XSS) vulnerability

CVE-2026-105061 · Severity: high · CVSS 7.1 · Published 2026-10-06

WP Mailster is a WordPress plugin for email marketing and newsletter management. An unauthenticated attacker can inject malicious scripts into the site through a stored XSS vulnerability, allowing them to steal visitor data, hijack accounts, or perform actions on behalf of site users. The vulnerability affects all versions up to 1.9.0.0 and requires user interaction (such as clicking a link) to exploit.

Technologies: WP Mailster. Vendors: WP Mailster.

Quick answers

Is CVE-2026-105061 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-105061 being exploited in the wild.
How severe is CVE-2026-105061?
High severity, with a CVSS score of 7.1, published 6 October 2026.
Which products and versions are affected?
WP Mailster <=1.9.0.0.
Is there a fix for CVE-2026-105061?
Yes: fixed in 1.9.1.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-105061 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-105061?
Check whether you run WP Mailster at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: 1.9.1.0

Technical details

The plugin contains a cross-site scripting (XSS) vulnerability that allows unauthenticated attackers to inject malicious scripts. Exploitation requires user interaction but no authentication. A fix is available in version 1.9.1.0 and later.

Affected products

  • WP Mailster WP Mailster <=1.9.0.0

Timeline

  • 2026-10-06: disclosed
  • 2026-10-05: advisory

References

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