CVE-2025-0521 Post SMTP <= 3.0.2 - Unauthenticated Stored Cross-Site Scripting
Unauthenticated attackers can inject arbitrary web scripts via email parameters, leading to script execution when users view affected pages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-0521?
CVE-2025-0521 is a high-severity cross-site scripting vulnerability in saadiqbal Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App, published on 18 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2025-0521?
It affects 1 product.
Products include Wpexperts Post Smtp.
How do I fix CVE-2025-0521?
No fix has been published for CVE-2025-0521 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-0521 being exploited?
There is no known exploitation of CVE-2025-0521 in the wild and no public exploit code.
Other vulnerabilities in saadiqbal Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
- CVE-2023-6875 Auth bypass in Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
- CVE-2023-3179 POST SMTP Mailer < 2.5.7 - Account Takeover via CSRF
- CVE-2023-52233 WordPress POST SMTP Mailer plugin <= 2.8.6 - Broken Access Control on API vulnerability
- CVE-2024-52436 WordPress Post SMTP plugin <= 2.9.9 - SQL Injection vulnerability
- CVE-2024-5207 SQL injection in Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
Sources
Also known as GHSA-3f9v-jhc5-p8jp.