CVE-2025-22303: WordPress WP Mailster plugin <= 1.8.17.0 - Sensitive Data Exposure vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-01-07 · updated 2026-06-17
Weakness: CWE-201

Description

Insertion of Sensitive Information Into Sent Data vulnerability in brandtoss WP Mailster wp-mailster allows Retrieve Embedded Sensitive Data.This issue affects WP Mailster: from n/a through <= 1.8.17.0.

Affected products

brandtoss WP Mailster: before 1.8.18 — fixed in 1.8.18

How to fix

Upgrade to a fixed version: brandtoss WP Mailster 1.8.18. Check the vendor advisory for mitigations.

References

https://patchstack.com/database/Wordpress/Plugin/wp-mailster/vulnerability/wordpress-wp-mailster-plugin-1-8-17-0-sensitive-data-exposure-vulnerability?_s_id=cve

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