What is broken access control?
Broken Access Control (BAC) is a security vulnerability that occurs when restrictions on accessing resources or functions within a system are not properly defined or enforced.
Azərbaycanca: Broken Access Control (BAC) təhlükəsizlik zəifliyi sistemdəki resurslara və ya funksiyalara giriş məhdudiyyətlərinin düzgün qurulmaması və ya idarə edilməməsi nəticəsində yaranan bir təhlükəsizlik problemidir.
How it works
In systems with BAC vulnerabilities, attackers can access resources or functions beyond their authorized privileges. This can allow authenticated or unauthenticated users to gain access to sensitive data or administrative functions.
Defense checklist5
- 01
Clearly define and enforce access controls for resources and functions within the system.
- 02
Properly manage user roles and privileges.
- 03
Implement proper authentication and authorization mechanisms.
- 04
Regularly update system components and plugins.
- 05
Conduct security audits and testing.
Real-world evidence
For example, CVE-2026-57367 (WP Booking System < 5.12.8.1), CVE-2026-57703 (Sunshine Photo Cart <= 3.6.10.1), CVE-2026-27418 (WP Fast Total Search <= 1.81.282), and other given incidents demonstrate BAC vulnerabilities in WordPress plugins.
Sources
- CVE-2026-57367: Subscriber Broken Access Control in WP Booking System < 5.12.8.1 versions.nvd
- CVE-2026-57703: Subscriber Broken Access Control in Sunshine Photo Cart <= 3.6.10.1 versions.nvd
- CVE-2026-27418: Unauthenticated Broken Access Control in WP Fast Total Search <= 1.81.282 versions.nvd
- CVE-2026-57425: Unauthenticated Broken Access Control in Autopay dla WooCommerce <= 2.2.27 versions.nvd
- CVE-2026-57717: Unauthenticated Broken Access Control in Knit Pay <= 9.6.0.0 versions.nvd
- CVE-2026-27392: Contributor Broken Access Control in uListing <= 2.2.0 versions.nvd
- CVE-2026-27391: Subscriber Broken Access Control in uListing <= 2.2.0 versions.nvd
- CVE-2026-27377: Booking Agent Broken Access Control in QuickCal - Appointment Booking Calendar for WordPrenvd
- CVE-2026-25427: Subscriber Broken Access Control in eRoom <= 1.7.1 versions.nvd
- CVE-2026-25466: Unauthenticated Broken Access Control in WP Go Maps <= 10.1.04 versions.nvd
- CVE-2026-27355: Unauthenticated Broken Access Control in Ditty <= 3.1.66 versions.nvd
- CVE-2026-25424: Contributor Broken Access Control in Mediavine Control Panel <= 2.10.10 versions.nvd
Other attack types
See also6
This guide is AI-written from the real incident sources skopnix collected — the examples above are drawn from those cited items, nothing is invented.