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CVE-2026-12939— Newsletters <= 4.15 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'link' Shortcode Attribute

Quick assessment

Affected
contrid Newsletters
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 Newsletters是WordPress基金会的一款由 Tribulant Software 开发的 WordPress 邮件订阅与新闻通讯插件，提供邮件列表管理、模板构建、订阅表单、邮件追踪、自动回复等全功能，支持免费版和付费专业版。 WordPress Newsletters 4.15及之前版本存在跨站脚本漏洞，该漏洞源于post_thumbnail()方法中对用户控制的$link属性输入清理和输出转义不足，可能导致经过身份验证的攻击者（贡献者级别及以上）注入任意Web脚本，触发

CVSS 6.4 · Medium EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1059.001 · PowerShell

Affected Version Matrix 1

VendorProduct Version RangeStatus
contrid Newsletters ≤ 4.15 affected
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I. Basic Information for CVE-2026-12939

Vulnerability Information
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Vulnerability Title
Newsletters <= 4.15 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'link' Shortcode Attribute
Source: CVE Program / CVE List V5
Vulnerability Description
The Newsletters Lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'link' attribute of the post_thumbnail (and newsletters_post_thumbnail) shortcodes in versions up to and including 4.15. This is due to insufficient input sanitization and output escaping in the post_thumbnail() method in helpers/shortcode.php, which concatenates the user-controlled $link shortcode attribute directly into an href attribute without esc_url() or esc_attr(). This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Newsletters 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Newsletters是WordPress基金会的一款由 Tribulant Software 开发的 WordPress 邮件订阅与新闻通讯插件，提供邮件列表管理、模板构建、订阅表单、邮件追踪、自动回复等全功能，支持免费版和付费专业版。 WordPress Newsletters 4.15及之前版本存在跨站脚本漏洞，该漏洞源于post_thumbnail()方法中对用户控制的$link属性输入清理和输出转义不足，可能导致经过身份验证的攻击者（贡献者级别及以上）注入任意Web脚本，触发
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
contrid Newsletters 0 ~ 4.15 -

II. Public POCs for CVE-2026-12939

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III. Intelligence Information for CVE-2026-12939

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Patches & Fixes for CVE-2026-12939 (2)

Vendor Advisories for CVE-2026-12939 (1)

IV. Related Vulnerabilities

Same product: Newsletters
Same vendor: contrid
Same weakness: CWE-79

V. Comments for CVE-2026-12939

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