Threat intelligence

Mailster < 4.1.14 - Reflected Cross-Site Scripting

CVE-2025-64203 · mailster

Important: Seeing this vulnerability listed does not mean your website is affected. Exposure depends on whether you run Mailster at a vulnerable version. How SiteRespond intelligence works

Vulnerability: Mailster < 4.1.14 - Reflected Cross-Site Scripting
Affected software: mailster(Plugin)
Affected versions: < 4.1.14
Authentication: Not specified in feed title — see source advisory
Vulnerability type: Cross-site scripting
CVE: CVE-2025-64203
Published: 27 October 2025
CISA KEV: Not listed in CISA KEV at last catalog refresh
Impact: May allow attackers to run scripts in visitors' browsers or hijack admin sessions.
Source: Data imported from Wordfence Intelligence (advisory 00ba947e-a9c8-4787-9acb-0fa6e0487347). Methodology and redistribution notes

Check whether your installed version is affected

SiteRespond Defence matches your installed Mailster version against this catalog when the Defence plugin is connected to your WordPress site.

Start SiteRespond Defence for WordPress — £29.99/monthScan your website

All Mailster advisoriesBack to catalog