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CVE-2026-16145— Invisible Anti-Spam & CAPTCHA <= 5.1 - Unauthenticated Stored Cross-Site Scripting via 'action' Parameter

Quick assessment

Affected
matthiasnordwig Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms
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 Invisible Anti-Spam & CAPTCHA是WordPress基金会开源的一款隐形反垃圾邮件与验证码组件。 WordPress Invisible Anti-Spam & CAPTCHA 5.1及之前版本存在跨站脚本漏洞，该漏洞源于对'action'参数输入清理和输出转义不足，可能导致未经身份验证的攻击者通过admin-ajax.php请求注入任意Web脚本，当用户访问被注入的页面时脚本会执行。

CVSS 7.2 · High EPSS 0.46% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
matthiasnordwig Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms ≤ 5.1 affected
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I. Basic Information for CVE-2026-16145

Vulnerability Information
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Vulnerability Title
Invisible Anti-Spam & CAPTCHA <= 5.1 - Unauthenticated Stored Cross-Site Scripting via 'action' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'action' parameter in all versions up to, and including, 5.1 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 stored payload is written by any unauthenticated admin-ajax.php request whose action value matches an entry in the plugin's explicit-actions list, which is auto-populated for common form builders at activation and requires no authentication gate to reach the save path.
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
Vulnerability Title
WordPress Invisible Anti-Spam & CAPTCHA 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Invisible Anti-Spam & CAPTCHA是WordPress基金会开源的一款隐形反垃圾邮件与验证码组件。 WordPress Invisible Anti-Spam & CAPTCHA 5.1及之前版本存在跨站脚本漏洞，该漏洞源于对'action'参数输入清理和输出转义不足，可能导致未经身份验证的攻击者通过admin-ajax.php请求注入任意Web脚本，当用户访问被注入的页面时脚本会执行。
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
matthiasnordwig Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms 0 ~ 5.1 -

II. Public POCs for CVE-2026-16145

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III. Intelligence Information for CVE-2026-16145

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Vendor Advisories for CVE-2026-16145 (1)

Same Patch Batch · matthiasnordwig · 2026-08-15 · 3 CVEs total

CVE-2026-16146 4.9 MEDIUM Invisible Anti-Spam & CAPTCHA <= 5.1 - Authenticated (Editor+) SQL Injection via Pattern J
CVE-2026-16094 4.9 MEDIUM Invisible Anti-Spam & CAPTCHA <= 5.1 - Authenticated (Editor+) SQL Injection via 'key' Par

IV. Related Vulnerabilities

Same product: Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms
Same vendor: matthiasnordwig
Same weakness: CWE-79

V. Comments for CVE-2026-16145

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