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CVE-2026-103482— Simple Newsletter Plugin <= 4.3.10 - Unauthenticated Stored Cross-Site Scripting via Subscriber Custom Field via Manage Preferences Form + Campaign Preview noptin_key Pivot

Quick assessment

Affected
picocodes Noptin – Newsletter, New Post Notifications & Email Automation
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.

WordPress 的 Simple Newsletter 插件（Noptin 插件）在所有 4.3.10 及更早版本中，存在因输入过滤和输出转义不足而导致的存储型跨站脚本（Stored XSS）漏洞，漏洞参数为 （例如 ）。该漏洞使未经身份验证的攻击者能够在网页中注入任意 Web 脚本，当用户访问被注入的页面时，脚本将自动执行。 利用此漏洞的攻击链需要包含合并标签 的已发布活动帖子（campaign post）正文。未经身份验证的攻击者首先通过公开的“管理偏好”（manage_preferences）表单以 PO

CVSS 5.4 · Medium EPSS 0.31% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
picocodes Noptin – Newsletter, New Post Notifications & Email Automation ≤ 4.3.10 affected
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I. Basic Information for CVE-2026-103482

Vulnerability Information
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Vulnerability Title
Simple Newsletter Plugin <= 4.3.10 - Unauthenticated Stored Cross-Site Scripting via Subscriber Custom Field via Manage Preferences Form + Campaign Preview noptin_key Pivot
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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
picocodes Noptin – Newsletter, New Post Notifications & Email Automation 0 ~ 4.3.10 -

II. Public POCs for CVE-2026-103482

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-103482

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Patches & Fixes for CVE-2026-103482 (1)

Vendor Advisories for CVE-2026-103482 (1)

Other References for CVE-2026-103482 (2)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-103482

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