CVE-2025-0521: Post SMTP <= 3.0.2 - Unauthenticated Stored Cross-Site Scripting
Description
The Post SMTP plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the from and subject parameter in all versions up to, and including, 3.0.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Classification
CVE ID: CVE-2025-0521
CVSS Base Severity: HIGH
CVSS Base Score: 7.2
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Affected Products
Vendor: saadiqbal
Product: Post SMTP – WordPress SMTP Plugin with Email Logs and Mobile App for Failure Notifications – Gmail SMTP, Office 365, Brevo, Mailgun, Amazon SES and more
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.08% (probability of being exploited)
EPSS Percentile: 19.97% (scored less or equal to compared to others)
EPSS Date: 2025-03-19 (when was this score calculated)
References
https://www.wordfence.com/threat-intel/vulnerabilities/id/366dfbf1-870c-4ce3-abc4-a2b2f4e72175?source=cvehttps://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3237626%40post-smtp%2Ftrunk&old=3229076%40post-smtp%2Ftrunk&sfp_email=&sfph_mail=