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.

Vulnerability/
CVE-2025-0521

high

7.2

CWE

18/2/2025

21/2/2025

CVE-2025-0521: Post SMTP <= 3.0.2 - Unauthenticated Stored Cross-Site Scripting

First published: Tue Feb 18 2025(Updated: )

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.

Credit: security@wordfence.com

Affected Software	Affected Version	How to fix
Post SMTP	<=3.0.2
Wpexperts Post SMTP	<3.1.0

Remedy

https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3237626%40post-smtp%2Ftrunk&old=3229076%40post-smtp%2Ftrunk&sfp_email=&sfph_mail=

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Reference Links

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.

collector/mitre-cve
source/MITRE
agent/weakness
agent/title
agent/references
agent/first-publish-date
agent/description
agent/type
agent/guess-ai
agent/software-canonical-lookup
agent/author
agent/source
collector/nvd-api
source/NVD
agent/event
agent/last-modified-date
agent/remedy
agent/severity
agent/softwarecombine
agent/tags
vendor/post smtp
canonical/post smtp
vendor/wpexperts
canonical/wpexperts post smtp

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