CVE-2026-103482
Received Received - Intake

Stored XSS in Simple Newsletter Plugin for WordPress

Publication date: 2026-10-10

Last updated on: 2026-10-10

Assigner: Wordfence

Description
The Simple Newsletter Plugin – Noptin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'noptin_fields[<custom_field_merge_tag>] (e.g. first_name)' parameter in all versions up to, and including, 4.3.10 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. The attack chain requires a published campaign post whose body contains a [[subscriber.*]] merge tag; the unauthenticated attacker first POSTs the entity-encoded payload to the public manage_preferences form (which issues its own nonce on the same page), then pivots execution by embedding their confirm_key in a campaign preview URL sent to a privileged user via social engineering.

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Meta Information

Published
2026-10-10
Last Modified
2026-10-10
Generated
2026-10-10
AI Q&A
2026-10-10
EPSS Evaluated
N/A
NVD
CVE-2026-103482
EUVD
EUVD-2026-96112

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
picocodes Noptin – Newsletter, New Post Notifications & Email Automation 0

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 vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Simple Newsletter Plugin – Noptin for WordPress. It allows unauthenticated attackers to inject malicious scripts into web pages by exploiting insufficient input sanitization and output escaping in the 'noptin_fields[<custom_field_merge_tag>]' parameter. The attack requires a published campaign post with a specific merge tag and involves tricking a user into accessing a crafted URL.

Detection Guidance

Check WordPress installations for the Simple Newsletter Plugin – Noptin versions up to 4.3.10. Inspect pages containing [[subscriber.*]] merge tags for malicious scripts in noptin_fields parameters. Review server logs for POST requests to manage_preferences forms with unusual payloads.

Impact Analysis

If exploited, this vulnerability could allow attackers to execute arbitrary web scripts in your browser when you visit an infected page. This may lead to theft of cookies, session tokens, or other sensitive data. Attackers could also perform actions on your behalf or redirect you to malicious sites without your knowledge.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, potentially violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Organizations using the affected plugin may face compliance violations, legal liabilities, and reputational damage if exploited.

Mitigation Strategies

Update the Noptin plugin to version 4.4.0 or later. Remove or sanitize any campaign posts containing [[subscriber.*]] merge tags. Implement input validation for noptin_fields parameters. Monitor for unauthorized script injections in WordPress pages.

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