CVE-2026-66689
Deferred Deferred - Pending Action

Unauthenticated Broken Access Control in AcyChecker <= 2.0.0

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: Patchstack

Description
Unauthenticated Broken Access Control in Anti Spam and list cleaner &#8211; AcyChecker <= 2.0.0 versions.

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Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-09-03
AI Q&A
2026-08-13
EPSS Evaluated
2026-09-01
NVD
CVE-2026-66689
EUVD
EUVD-2026-57901

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
acychecker acychecker to 2.0.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

This vulnerability is an Unauthenticated Broken Access Control in the AcyChecker WordPress plugin versions 2.0.0 and below. It allows unauthenticated users to perform actions that require higher privileges due to missing authorization, authentication, or nonce token checks.

Detection Guidance

Detecting this vulnerability requires checking if the AcyChecker plugin version 2.0.0 or below is installed on your WordPress site. You can use commands like 'wp plugin list' in WordPress CLI or inspect the plugin files directly for version information.

Impact Analysis

This vulnerability may allow attackers to perform unauthorized actions on your website, potentially leading to data breaches, defacement, or further compromise. It is considered moderately dangerous and may be exploited in mass campaigns targeting many websites.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing unauthorized access to sensitive data due to broken access control. Unauthenticated users may perform privileged actions, risking data breaches or unauthorized modifications, which violate confidentiality and integrity requirements in these regulations.

Mitigation Strategies

Immediately update the AcyChecker plugin to version 2.0.1 or later. If updating is not possible, apply Patchstack's mitigation rule to block attacks until the update is completed.

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