CVE-2025-0521: Post SMTP <= 3.0.2 - Unauthenticated Stored Cross-Site Scripting
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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-0521?
CVE-2025-0521 is classified as a high severity vulnerability due to its potential for Stored Cross-Site Scripting.
How do I fix CVE-2025-0521?
To fix CVE-2025-0521, update the Post SMTP plugin to the latest version beyond 3.0.2.
Who is affected by CVE-2025-0521?
CVE-2025-0521 affects all versions of the Post SMTP plugin for WordPress up to and including version 3.0.2.
What type of vulnerability is CVE-2025-0521?
CVE-2025-0521 is a Stored Cross-Site Scripting vulnerability resulting from insufficient input sanitization and output escaping.
Can CVE-2025-0521 be exploited by authenticated users?
No, CVE-2025-0521 can be exploited by unauthenticated attackers, making it particularly dangerous.