CVE-2026-26483
Received Received - Intake

Stored XSS in Mettle SendPortal Template Management

Publication date: 2026-07-20

Last updated on: 2026-07-20

Assigner: MITRE

Description
Mettle SendPortal 3.0.1 and earlier contains a stored cross-site scripting (XSS) vulnerability in the template management functionality. The application fails to properly sanitize user-supplied input in the content parameter of the /templates endpoint, allowing an attacker to persistently inject malicious JavaScript code that is executed in the browsers of users who access the affected template.

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Meta Information

Published
2026-07-20
Last Modified
2026-07-20
Generated
2026-07-21
AI Q&A
2026-07-20
EPSS Evaluated
N/A
NVD
CVE-2026-26483
EUVD
EUVD-2026-46050

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mettle sendportal to 3.0.1 (inc)
mettle sendportal to 3.0.1 (exc)

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

CVE-2026-26483 is a stored cross-site scripting (XSS) vulnerability in Mettle SendPortal versions 3.0.1 and earlier. It occurs because the application does not properly sanitize user input in the content parameter of the /templates endpoint. Attackers can inject malicious JavaScript code that is stored and later executed in the browsers of users who view the affected template.

Detection Guidance

Check SendPortal versions by inspecting the application or reviewing logs. Look for unauthorized template modifications or unusual JavaScript in template content. Use browser developer tools to inspect rendered templates for injected scripts.

Impact Analysis

This vulnerability allows an authenticated attacker to inject malicious JavaScript into templates. When other users view these templates, the injected code executes in their browsers, potentially leading to session hijacking, theft of sensitive data, or other client-side attacks.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, which may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations using affected versions may face compliance violations if user data is compromised through this XSS flaw.

Mitigation Strategies

Upgrade SendPortal to the latest version beyond 3.0.1. Implement strict input validation for template content. Sanitize all user-supplied data before rendering. Restrict template editing permissions to trusted users only.

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