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CVE-2026-15759— ChatHelp <= 3.5.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'number' and 'group' Shortcode Attributes

Quick assessment

Affected
themeatelier ChatHelp – Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form
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 ChatHelp是WordPress基金会的一款组件。 WordPress ChatHelp 3.5.1及之前版本存在跨站脚本漏洞，该漏洞源于对'number'和'group' Shortcode Attributes的输入清理和输出转义不足，容易受到存储型跨站脚本攻击，可能导致经过身份验证的攻击者（至少具有贡献者级别访问权限）注入任意Web脚本并在用户访问时执行。

CVSS 6.4 · Medium EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
themeatelier ChatHelp – Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form ≤ 3.5.1 affected
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I. Basic Information for CVE-2026-15759

Vulnerability Information
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Vulnerability Title
ChatHelp <= 3.5.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'number' and 'group' Shortcode Attributes
Source: CVE Program / CVE List V5
Vulnerability Description
The ChatHelp – Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'number' and 'group' Shortcode Attributes in all versions up to, and including, 3.5.1 due to insufficient input sanitization and output escaping. 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 ChatHelp 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress ChatHelp是WordPress基金会的一款组件。 WordPress ChatHelp 3.5.1及之前版本存在跨站脚本漏洞，该漏洞源于对'number'和'group' Shortcode Attributes的输入清理和输出转义不足，容易受到存储型跨站脚本攻击，可能导致经过身份验证的攻击者（至少具有贡献者级别访问权限）注入任意Web脚本并在用户访问时执行。
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
themeatelier ChatHelp – Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form 0 ~ 3.5.1 -

II. Public POCs for CVE-2026-15759

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III. Intelligence Information for CVE-2026-15759

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Patches & Fixes for CVE-2026-15759 (4)

Vendor Advisories for CVE-2026-15759 (1)

Other References for CVE-2026-15759 (1)

IV. Related Vulnerabilities

Same product: ChatHelp – Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form
Same vendor: themeatelier
Same weakness: CWE-79

V. Comments for CVE-2026-15759

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