CVE-2026-66606
Deferred Deferred - Pending Action

Unauthenticated XSS in SmartSMTP

Publication date: 2026-08-20

Last updated on: 2026-08-20

Assigner: Patchstack

Description
Unauthenticated Cross Site Scripting (XSS) in SmartSMTP <= 1.2.0 versions.

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Meta Information

Published
2026-08-20
Last Modified
2026-08-20
Generated
2026-08-20
AI Q&A
2026-08-20
EPSS Evaluated
N/A
NVD
CVE-2026-66606
EUVD
EUVD-2026-63293

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
patchstack smart_smtp to 1.2.1 (exc)
smartsmtp smartsmtp to 1.2.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is an Unauthenticated Cross Site Scripting (XSS) vulnerability in the SmartSMTP WordPress plugin versions 1.2.0 and below. It allows attackers to inject malicious scripts into websites that execute when visitors access the site, potentially causing redirects or unwanted content display.

Detection Guidance

Detecting this XSS vulnerability requires checking if the SmartSMTP plugin version 1.2.0 or below is installed. Inspect WordPress plugins via the admin dashboard or check the plugin files on the server for the vulnerable version.

Impact Analysis

The vulnerability can lead to actions like website redirects, display of unwanted content, or theft of user data if a privileged user interacts with a malicious link or form. Attackers may exploit it in mass campaigns, increasing risk of widespread impact.

Compliance Impact

This XSS vulnerability could lead to unauthorized script execution on websites, potentially enabling attackers to steal sensitive user data or manipulate content. Such breaches may violate GDPR (data protection) and HIPAA (healthcare data privacy) by exposing personal or protected health information, depending on the website's use case.

Mitigation Strategies

Immediately update the SmartSMTP plugin to version 1.2.1 or later. If updating is not possible, use mitigation tools like Patchstack to block attacks until the update is applied.

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