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CVE-2026-66689— WordPress Anti Spam and list cleaner – AcyChecker plugin <= 2.0.0 - Broken Access Control vulnerability

Quick assessment

Affected
AcyMailing Newsletter Team Anti Spam and list cleaner &#8211; AcyChecker
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 AcyChecker是WordPress基金会开源的一款CMS插件。 WordPress AcyChecker 2.0.0及之前版本存在授权问题漏洞，该漏洞源于未经验证的访问控制失效，可能导致攻击者绕过访问控制。

CVSS 6.3 · Medium EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
AcyMailing Newsletter Team Anti Spam and list cleaner &#8211; AcyChecker n/a≤ 2.0.0 affected
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I. Basic Information for CVE-2026-66689

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
WordPress Anti Spam and list cleaner – AcyChecker plugin <= 2.0.0 - Broken Access Control vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Unauthenticated Broken Access Control in Anti Spam and list cleaner &#8211; AcyChecker <= 2.0.0 versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress AcyChecker 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress AcyChecker是WordPress基金会开源的一款CMS插件。 WordPress AcyChecker 2.0.0及之前版本存在授权问题漏洞，该漏洞源于未经验证的访问控制失效，可能导致攻击者绕过访问控制。
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
AcyMailing Newsletter Team Anti Spam and list cleaner &#8211; AcyChecker n/a ~ 2.0.0 -

II. Public POCs for CVE-2026-66689

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III. Intelligence Information for CVE-2026-66689

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Vendor Advisories for CVE-2026-66689 (1)

Same Patch Batch · AcyMailing Newsletter Team · 2026-08-13 · 3 CVEs total

CVE-2026-28181 6.5 MEDIUM WordPress AcyMailing SMTP Newsletter plugin <= 10.11.1 - Broken Access Control vulnerabili
CVE-2026-28182 6.5 MEDIUM WordPress AcyMailing SMTP Newsletter plugin <= 10.11.1 - Cross Site Scripting (XSS) vulner

IV. Related Vulnerabilities

Same product: Anti Spam and list cleaner &#8211; AcyChecker
Same vendor: AcyMailing Newsletter Team
Same weakness: CWE-862

V. Comments for CVE-2026-66689

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