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CVE-2026-96566— Newsletter <= 9.4.0 - Unauthenticated Stored Cross-Site Scripting via 'np1' Custom Field Parameter

Quick assessment

Affected
satollo Newsletter – Send awesome emails from WordPress
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

“The Newsletter – Send awesome emails from WordPress” 是一款用于 WordPress 的插件，在所有版本号不超过 9.4.0 的版本中，由于对输入缺乏足够的净化措施以及对输出缺乏适当的转义处理，存在基于 自定义字段参数的存储型跨站脚本漏洞（Stored Cross-Site Scripting, XSS）。该漏洞使得未经身份验证的攻击者能够向网页中注入任意 Web 脚本，当其他用户访问被注入的页面时，这些脚本便会执行。 此外，该插件的订阅端点（参数为 ）未实施

CVSS 7.2 · High EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
satollo Newsletter – Send awesome emails from WordPress ≤ 9.4.0 affected
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I. Basic Information for CVE-2026-96566

Vulnerability Information
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Vulnerability Title
Newsletter <= 9.4.0 - Unauthenticated Stored Cross-Site Scripting via 'np1' Custom Field Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Newsletter – Send awesome emails from WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'np1' Custom Field Parameter in all versions up to, and including, 9.4.0 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 subscription endpoint (na=sa) requires no nonce, no capability check, and no CAPTCHA, and the payload can be smuggled past email-address validation by embedding the {profile_1} placeholder in the local part of the submitted address, since WordPress's is_email() permits curly braces there.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
satollo Newsletter – Send awesome emails from WordPress 0 ~ 9.4.0 -

II. Public POCs for CVE-2026-96566

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III. Intelligence Information for CVE-2026-96566

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Patches & Fixes for CVE-2026-96566 (1)

News Coverage for CVE-2026-96566 (1)

IV. Related Vulnerabilities

Same product: Newsletter – Send awesome emails from WordPress
Same vendor: satollo
Same weakness: CWE-79

V. Comments for CVE-2026-96566

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