CVE-2026-22398: 
WordPress vulnerability analysis and mitigation

CVE-2026-22398 is an Authorization Bypass Through User-Controlled Key (IDOR) vulnerability in the Mikado-Themes Fleur WordPress theme. It allows authenticated attackers with low privileges to exploit incorrectly configured access control security levels. The vulnerability affects Fleur versions up to and including 2.0. It was published on January 22, 2026, and assigned a CVSS v3.1 base score of 5.4 (Medium) by Patchstack (Feedly, Patchstack).

The vulnerability is classified as CWE-639 (Authorization Bypass Through User-Controlled Key), commonly known as an Insecure Direct Object Reference (IDOR). An attacker with a low-privilege authenticated account can manipulate user-controlled keys or object references to access or modify resources they are not authorized to interact with, due to insufficient server-side access control validation in the theme. The attack vector is network-based, requires low privileges, no user interaction, and has low attack complexity (Feedly, Patchstack).

Successful exploitation of this vulnerability can result in limited integrity and availability impacts on the affected WordPress installation. An authenticated attacker could modify or delete data objects they should not have access to, and potentially disrupt certain theme-related functionality. Confidentiality impact is assessed as none, meaning direct data disclosure is not the primary risk, but unauthorized data manipulation remains a concern (Feedly).

The EPSS score for CVE-2026-22398 is approximately 0.017%, indicating a low probability of exploitation in the wild at this time. No public proof-of-concept exploit code, active in-the-wild exploitation, or threat actor attribution has been reported. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Exploitation requires at minimum a low-privileged authenticated account on the target WordPress site (Feedly).

1. Reconnaissance: Identify WordPress sites running the Fleur theme (version ≤ 2.0) by inspecting page source for theme references (e.g., /wp-content/themes/fleur/) or using tools like WPScan.
2. Obtain low-privilege access: Register or obtain a low-privilege account (e.g., subscriber) on the target WordPress site.
3. Identify vulnerable object references: Interact with theme-specific functionality (e.g., forms, settings, or content endpoints) and observe user-controlled parameters such as IDs or keys in requests.
4. Manipulate object references: Modify the user-controlled key/ID parameter in HTTP requests to reference objects belonging to other users or restricted resources.
5. Achieve unauthorized action: Successfully read, modify, or delete resources beyond the attacker's authorization level, exploiting the lack of proper server-side access control checks in the Fleur theme (Patchstack).

• Logs: WordPress access logs showing authenticated requests with sequentially enumerated or manipulated object ID parameters targeting theme-specific endpoints; repeated HTTP requests from a single low-privilege user account accessing resources belonging to other users.
• Network: Unusual patterns of authenticated POST or GET requests to WordPress theme endpoints with varying object reference values from the same source IP.
• Application: Unexpected modifications to theme-related content, settings, or objects not initiated by their owners, visible in WordPress revision history or audit logs.

Users should update the Fleur WordPress theme to a version beyond 2.0 if a patched release is available from Mikado-Themes. If no patch is yet available, consider deactivating the theme and switching to an alternative until a fix is released. Site administrators should also enforce the principle of least privilege, limiting user registrations and low-privilege account creation where possible. Monitoring WordPress audit logs for anomalous access patterns can help detect exploitation attempts (Patchstack).