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CVE-2026-102562— AcyMailing <= 11.1.0 - Unauthenticated Stored Cross-Site Scripting via 'customField[]' Parameter

Quick assessment

Affected
acyba AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for 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.

WordPress 的 AcyMailing 插件存在存储型跨站脚本（Stored Cross-Site Scripting, XSS）漏洞，该漏洞出现在版本 11.1.0 及更早版本中，可通过 public frontusers::subscribe 端点的 customField[] 参数触发。其根本原因在于 acym_cleanVar() 清理函数中的输入清理和输出转义措施不足：该函数中的 HTML 标签剥离器仅匹配完整的标签（即必须包含闭合的 '>' 字符），同时 SubscriberInsertion::

CVSS 7.2 · High EPSS 0.25% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
acyba AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress ≤ 11.1.0 affected
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I. Basic Information for CVE-2026-102562

Vulnerability Information
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Vulnerability Title
AcyMailing <= 11.1.0 - Unauthenticated Stored Cross-Site Scripting via 'customField[]' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The AcyMailing plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the customField[] parameter of the public frontusers::subscribe endpoint in versions up to, and including, 11.1.0. This is due to insufficient input sanitization and output escaping in the acym_cleanVar() sanitizer, whose HTML-tag stripper only matches complete tags (requiring a closing '>'), together with SubscriberInsertion::replaceUserInformation() and the archive view template, which substitute the stored subscriber field value into the mail body and emit it without HTML encoding. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses the online-archive URL for the poisoned subscriber, including administrators who click the plugin-generated link in the Subscribers → History screen.
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
acyba AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress 0 ~ 11.1.0 -

II. Public POCs for CVE-2026-102562

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III. Intelligence Information for CVE-2026-102562

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Other References for CVE-2026-102562 (4)

IV. Related Vulnerabilities

Same product: AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress
Same vendor: acyba
Same weakness: CWE-79

V. Comments for CVE-2026-102562

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