CVE-2025-30803: Just Writing Statistics Auth Bypass Flaw

CVE-2025-30803 Overview

CVE-2025-30803 is a missing authorization vulnerability in the Just Writing Statistics WordPress plugin developed by Greg Ross. The flaw affects all versions up to and including 5.3. Authenticated users with low privilege levels can invoke plugin actions that should be restricted to higher-privileged roles. The weakness is classified as [CWE-862] Missing Authorization.

The vulnerability stems from incorrectly configured access control on plugin endpoints. Exploitation requires network access and low-privileged authentication, but no user interaction. Successful attacks compromise integrity of plugin-managed data.

Critical Impact

Authenticated attackers with contributor-level or higher accounts can trigger restricted plugin functionality and modify statistics data managed by the plugin.

Affected Products

• Greg Ross Just Writing Statistics plugin for WordPress
• Versions from n/a through 5.3 (inclusive)
• WordPress sites with the plugin installed and active

Discovery Timeline

• 2025-03-27 - CVE-2025-30803 published to the National Vulnerability Database (NVD)
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-30803

Vulnerability Analysis

The Just Writing Statistics plugin exposes functionality intended for administrative use without enforcing appropriate capability checks. The plugin fails to validate whether the requesting user holds the required WordPress capability before executing sensitive actions. Any authenticated user meeting a minimal privilege threshold can therefore invoke these actions.

Broken access control in WordPress plugins typically appears in AJAX handlers, admin-post endpoints, or REST routes that omit current_user_can() checks. The plugin registers callbacks that respond to authenticated requests but relies solely on authentication rather than authorization. This design gap allows lower-tier roles such as Contributor or Subscriber to reach functionality intended for administrators or editors.

Root Cause

The root cause is missing authorization enforcement [CWE-862] on privileged plugin actions. The plugin does not verify user capabilities before performing state-changing operations. This omission means role separation, which WordPress otherwise enforces through capabilities, is not honored by the plugin's request handlers.

Attack Vector

Exploitation requires a valid authenticated session on the target WordPress instance. The attacker sends crafted HTTP requests to the vulnerable plugin endpoint over the network. No user interaction is required, and no elevated privileges are needed beyond the low-privilege account. Successful requests result in unauthorized modification of statistics data or invocation of restricted plugin functionality.

Refer to the Patchstack Vulnerability Report for endpoint-level technical details.

Detection Methods for CVE-2025-30803

Indicators of Compromise

• Unexpected HTTP POST requests from low-privileged accounts to admin-ajax.php or admin-post.php referencing Just Writing Statistics action names
• Unexplained changes to statistics tables or plugin-managed options in the WordPress database
• Access logs showing repeated requests to plugin endpoints from non-administrative user sessions

Detection Strategies

• Audit WordPress access logs for requests to plugin endpoints originating from Contributor, Author, or Subscriber accounts
• Compare current plugin version against 5.3 or earlier across all WordPress instances in the environment
• Review plugin action registrations for handlers that lack current_user_can() or nonce verification

Monitoring Recommendations

• Forward WordPress and web server logs to a centralized logging platform for correlation and long-term retention
• Alert on high-frequency requests to admin-ajax.php with plugin-specific action parameters from non-admin users
• Track plugin version inventory across managed WordPress sites and flag installations at or below version 5.3

How to Mitigate CVE-2025-30803

Immediate Actions Required

• Identify all WordPress sites running Just Writing Statistics version 5.3 or earlier
• Restrict account creation and review existing low-privilege accounts for legitimacy
• Deactivate the plugin on affected sites until a patched version is available and applied

Patch Information

At the time of NVD publication, the advisory references versions through 5.3 as affected without a confirmed fixed release. Monitor the Patchstack Vulnerability Report and the plugin's WordPress.org page for updated version guidance. Apply the vendor patch as soon as it becomes available.

Workarounds

• Deactivate and remove the Just Writing Statistics plugin if it is not required for site operations
• Deploy a Web Application Firewall (WAF) rule that blocks requests to the plugin's action handlers from non-administrative sessions
• Enforce the principle of least privilege on WordPress accounts and disable public user registration where possible