What’s Vulnerable › Vulnerabilities

CVE-2021-40377

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-08 · updated 2026-06-17
• Weakness: CWE-79

Description

SmarterTools SmarterMail 16.x before build 7866 has stored XSS. The application fails to sanitize email content, thus allowing one to inject HTML and/or JavaScript into a page that will then be processed and stored by the application.

Affected products

• SmarterTools SmarterMail: from 16.0.6345 before 16.3.7866 — fixed in 16.3.7866

How to fix

Upgrade to a fixed version: SmarterTools SmarterMail 16.3.7866. Check the vendor advisory for mitigations.

References

• https://www.smartertools.com/smartermail/release-notes/current
• https://www.smartertools.com/smartermail/release-notes/current

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