What is CVE-2025-64203?

CVE-2025-64203 is a high-severity vulnerability in Everpress Mailster, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2025-12-18.

How severe is CVE-2025-64203?

High severity. CVSS v3 base score is 7.1 out of 10.

XSS in Everpress Mailster

CVE-2025-64203

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in EverPress Mailster mailster allows Reflected XSS.This issue affects Mailster: from n/a through < 4.1.14.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (7.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L.

Affected products

Everpress Mailster — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

patchstack.com/database/Wordpress/Plugin/mailster/vulnerability/wordpress-mails… (vdb-entry)

Frequently asked questions

What is CVE-2025-64203?: CVE-2025-64203 is a high-severity vulnerability in Everpress Mailster, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2025-12-18.
How severe is CVE-2025-64203?: High severity. CVSS v3 base score is 7.1 out of 10.