CVE-2026-24362: 
WordPress vulnerability analysis and mitigation

CVE-2026-24362 is a Missing Authorization (Broken Access Control) vulnerability in the bdthemes Ultimate Post Kit WordPress plugin. It allows low-privileged authenticated attackers to exploit incorrectly configured access control security levels, affecting all versions up to and including 4.0.21. The vulnerability was reported on December 29, 2025, published by Patchstack on March 18, 2026, and assigned a CVSS v3.1 base score of 6.4 (Medium) (Patchstack, Feedly).

The root cause is classified as CWE-862 (Missing Authorization) — the plugin fails to perform adequate authorization checks before executing certain privileged actions, allowing lower-privileged users (e.g., Subscribers) to invoke functionality intended for higher-privileged roles. The attack vector is network-based, requires low privileges (Subscriber-level authentication), no user interaction, and has a changed scope, meaning the impact can extend beyond the vulnerable component itself. The vulnerability was discovered by security researcher 0xd4rk5id3 and reported through Patchstack's Active VDP program (Patchstack).

Successful exploitation results in low confidentiality and low integrity impacts with no availability impact, as reflected in the CVSS score. An attacker with Subscriber-level access could access restricted plugin functionality or data and perform actions beyond their intended privilege level. While the individual impact per exploitation is moderate, Patchstack notes that vulnerabilities of this class are commonly used in mass-exploit campaigns targeting thousands of WordPress sites simultaneously, regardless of site size or popularity (Patchstack).

No public proof-of-concept exploit code or confirmed in-the-wild exploitation has been reported at this time. The EPSS score is approximately 0.017%, indicating a currently low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. However, Patchstack classifies it as a medium-priority issue expected to be exploited in mass-campaign scenarios targeting WordPress plugins (Patchstack, Feedly).

1. Reconnaissance: Identify WordPress sites running the Ultimate Post Kit plugin (version ≤ 4.0.21) using tools like WPScan, Shodan, or by checking publicly accessible readme.txt files at /wp-content/plugins/ultimate-post-kit/readme.txt.
2. Obtain low-privileged access: Register or obtain a Subscriber-level account on the target WordPress site (many sites allow open registration).
3. Identify unprotected endpoints: Probe plugin-specific AJAX actions or REST API endpoints registered by Ultimate Post Kit that lack proper capability checks (e.g., wp_ajax_ hooks without current_user_can() validation).
4. Send unauthorized request: Craft and send an authenticated HTTP request (with valid nonce/session cookie) to the vulnerable endpoint, invoking a privileged action such as modifying plugin settings or accessing restricted post data.
5. Achieve objective: Depending on the specific unprotected function, exfiltrate restricted content, modify plugin configuration, or escalate further within the WordPress environment (Patchstack).

• Logs: WordPress access logs showing repeated POST requests to wp-admin/admin-ajax.php with Ultimate Post Kit-specific action parameters from low-privileged user sessions; unexpected access to plugin admin endpoints by Subscriber-level accounts.
• Network: Unusual volume of authenticated requests to /wp-admin/admin-ajax.php or plugin REST API routes from a single IP or user agent, potentially indicating automated scanning or exploitation.
• Application: Unexpected changes to Ultimate Post Kit plugin settings or post configurations not initiated by an administrator; new or modified content attributable to low-privileged user accounts.

The vendor bdthemes has released version 4.0.22 of the Ultimate Post Kit plugin, which patches this vulnerability. Site administrators should update immediately via the WordPress dashboard or by downloading the patched version from the WordPress plugin repository. Patchstack users benefit from a virtual patch (mitigation rule) that blocks exploitation attempts until the plugin is updated. If immediate updating is not possible, consider restricting user registration or disabling the plugin temporarily (Patchstack).

The vulnerability was disclosed through Patchstack's Active Vulnerability Disclosure Program (VDP) and credited to researcher 0xd4rk5id3. Patchstack flagged it as a medium-priority issue with potential for mass exploitation, consistent with their broader warnings about broken access control vulnerabilities in WordPress plugins being leveraged in automated attack campaigns. No significant broader media coverage or notable social media discussion has been identified beyond standard vulnerability database entries (Patchstack).