CVE-2025-0953 SMTP for Sendinblue – YaySMTP <= 1.2 - Unauthenticated Stored Cross-Site Scripting via Email Logs

What is CVE-2025-0953?

CVE-2025-0953 is a high-severity cross-site scripting vulnerability in yaycommerce SMTP for Sendinblue – YaySMTP, published on 22 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The SMTP for Sendinblue – YaySMTP plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 1.2 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-2025-0953?

It affects 1 product.

Products include Yaycommerce Yaysmtp.

How do I fix CVE-2025-0953?

No fix has been published for CVE-2025-0953 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-2025-0953 being exploited?

There is no known exploitation of CVE-2025-0953 in the wild and no public exploit code.

Other vulnerabilities in yaycommerce SMTP for Sendinblue – YaySMTP

• CVE-2025-0918 SMTP for SendGrid – YaySMTP <= 1.4 - Unauthenticated Stored Cross-Site Scripting via Email Logs High 7.2
• CVE-2025-0916 YaySMTP 2.4.9 - 2.6.2 - Unauthenticated Stored Cross-Site Scripting High 7.2
• CVE-2023-3093 YaySMTP <= 2.4.5 - Unauthenticated Stored Cross-Site Scripting via Email High 7.2
• CVE-2022-2370 YaySMTP < 2.2.1 - Subscriber+ SMTP Credentials Leak Medium 6.5
• CVE-2022-2371 YaySMTP < 2.2.1 - Subscriber+ Stored Cross-Site Scripting Medium 5.4

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-4429-qgp7-2cwq.