How severe is CVE-2025-0521?

High severity. CVSS v3 base score is 7.2 out of 10.

Is CVE-2025-0521 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Saadiqbal Post Smtp – Complete Email Deliverability And Solution With Logs, Alerts, Backup & Mobile App

CVE-2025-0521

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (24.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

security@wordfence.com (Third Party Advisory)
security@wordfence.com (Patch)

Frequently asked questions

What is CVE-2025-0521?: CVE-2025-0521 is a high-severity vulnerability in Saadiqbal Post Smtp – Complete Email Deliverability And Solution With Logs, Alerts, Backup & Mobile App, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2025-02-18.
How severe is CVE-2025-0521?: High severity. CVSS v3 base score is 7.2 out of 10.
Is CVE-2025-0521 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.