CVE-2026-39528: WP Delicious Auth Bypass Vulnerability

CVE-2026-39528 Overview

CVE-2026-39528 is a Missing Authorization vulnerability affecting the WP Delicious (delicious-recipes) WordPress plugin. This security flaw allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized access to plugin functionality that should be restricted to authenticated or privileged users.

The vulnerability stems from broken access control mechanisms within the plugin, classified under CWE-862 (Missing Authorization). WordPress sites using the vulnerable versions of WP Delicious are at risk of unauthorized actions being performed by malicious actors who can bypass intended security restrictions.

Critical Impact

Attackers can exploit missing authorization checks to access restricted plugin functionality, potentially leading to unauthorized data manipulation or privilege escalation on affected WordPress installations.

Affected Products

• WP Delicious (delicious-recipes) plugin versions through 1.9.5
• WordPress installations running vulnerable WP Delicious versions

Discovery Timeline

• 2026-04-08 - CVE-2026-39528 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2026-39528

Vulnerability Analysis

This vulnerability is classified as CWE-862: Missing Authorization, which occurs when software does not perform an authorization check when an actor attempts to access a resource or perform an action. In the context of the WP Delicious plugin, certain endpoints or functions lack proper capability checks to verify whether the requesting user has the necessary permissions.

Missing authorization vulnerabilities in WordPress plugins are particularly dangerous because they can allow unauthenticated or low-privileged users to perform administrative actions. The WP Delicious plugin, which provides recipe management functionality for WordPress sites, fails to properly validate user permissions before executing sensitive operations.

Root Cause

The root cause of CVE-2026-39528 is the absence of proper authorization checks within the WP Delicious plugin codebase. WordPress provides functions like current_user_can() and capability checks that plugin developers must implement to restrict access to sensitive functionality. When these checks are missing or improperly configured, any user—including unauthenticated visitors—may be able to invoke restricted functions.

This type of broken access control typically occurs when developers assume that obscurity of AJAX endpoints or admin URLs provides sufficient protection, rather than implementing explicit permission verification at the code level.

Attack Vector

The attack vector for this vulnerability involves sending crafted requests to plugin endpoints that lack proper authorization verification. An attacker would identify the vulnerable functionality within the WP Delicious plugin and construct HTTP requests that bypass the expected authentication flow.

Since this is a broken access control vulnerability, exploitation typically requires:

1. Identifying vulnerable AJAX actions or REST API endpoints exposed by the plugin
2. Crafting requests that directly invoke these endpoints without proper authentication
3. Exploiting the missing authorization checks to perform unauthorized actions such as modifying recipes, accessing restricted data, or manipulating plugin settings

The vulnerability allows attackers to exploit incorrectly configured access control security levels, meaning the intended permission structure exists but is not properly enforced. For technical details, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-39528

Indicators of Compromise

• Unexpected modifications to recipe content or plugin settings without legitimate admin activity
• Unusual AJAX or REST API requests targeting WP Delicious plugin endpoints from unauthenticated sources
• Log entries showing access to plugin administrative functions by non-privileged users
• Database changes to delicious_recipes related tables without corresponding admin sessions

Detection Strategies

• Monitor WordPress access logs for suspicious requests to /wp-admin/admin-ajax.php with delicious-recipes related actions
• Implement Web Application Firewall (WAF) rules to detect unauthorized access attempts to plugin endpoints
• Review authentication logs for patterns indicating access control bypass attempts
• Use WordPress security plugins to audit plugin activity and flag unauthorized operations

Monitoring Recommendations

• Enable detailed logging for all AJAX and REST API requests targeting the WP Delicious plugin
• Set up alerts for recipe content modifications occurring outside normal administrative workflows
• Regularly audit user permissions and plugin access patterns for anomalies
• Monitor for bulk or automated requests targeting plugin functionality

How to Mitigate CVE-2026-39528

Immediate Actions Required

• Update the WP Delicious (delicious-recipes) plugin to a patched version beyond 1.9.5 when available
• Restrict access to the WordPress admin area using IP allowlisting where feasible
• Review recent activity logs for signs of exploitation
• Consider temporarily deactivating the plugin if no patch is available and the site handles sensitive data

Patch Information

Organizations should monitor the WP Delicious plugin developer for security updates that address this missing authorization vulnerability. The vulnerability affects versions through 1.9.5, so users should upgrade to any version released after the security fix. Check the Patchstack Vulnerability Report for the latest patch status and remediation guidance.

Workarounds

• Implement additional access controls at the web server level (.htaccess rules) to restrict access to plugin AJAX endpoints
• Use a WordPress security plugin with virtual patching capabilities to block exploitation attempts
• Enable WordPress audit logging to detect and respond to unauthorized access attempts
• Consider using a Web Application Firewall (WAF) with rules specifically designed to protect against broken access control vulnerabilities