CVE-2025-30945: Taskbuilder Auth Bypass Vulnerability

CVE-2025-30945 Overview

CVE-2025-30945 is a missing authorization vulnerability in the Taskbuilder WordPress plugin affecting versions up to and including 4.0.7. The flaw allows unauthenticated attackers to access plugin functionality that is not properly constrained by access control lists (ACLs). The weakness is categorized under [CWE-862] Missing Authorization and stems from broken access control on plugin endpoints. Successful exploitation results in limited confidentiality impact without affecting data integrity or availability.

Critical Impact
Unauthenticated attackers can reach Taskbuilder functionality intended for authorized users, exposing limited information from affected WordPress sites over the network.

Affected Products

Taskbuilder WordPress plugin versions up to and including 4.0.7
WordPress sites running the affected Taskbuilder plugin
Any deployment exposing the plugin endpoints to network-based requests

Discovery Timeline

2025-06-06 - CVE-2025-30945 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-30945

Vulnerability Analysis

The Taskbuilder plugin exposes functionality that lacks proper authorization checks. When an HTTP request reaches an affected endpoint, the plugin executes the requested action without validating whether the caller holds the required capability or role. This authorization gap allows network-based callers with no prior privileges to reach features that should be restricted.

The attack requires no user interaction and no authentication. Because the impact is limited to confidentiality, an attacker can read information exposed by the unprotected endpoint but cannot alter data or degrade service through this flaw alone. Site owners running Taskbuilder 4.0.7 or earlier are affected until the vendor patch is applied.

Root Cause

The root cause is a missing authorization check ([CWE-862]) on one or more plugin request handlers. The affected handlers omit calls to WordPress capability functions such as current_user_can() or nonce validation via check_ajax_referer(). Without these checks, the plugin treats unauthenticated requests as legitimate and processes them normally.

Attack Vector

An attacker sends a crafted HTTP request to the vulnerable Taskbuilder endpoint over the network. The request targets plugin actions exposed through the WordPress admin-ajax.php handler or REST route registered by the plugin. Because the endpoint does not enforce authorization, the response returns data or triggers behavior intended for privileged users. No credentials, session cookies, or user interaction are required. Refer to the Patchstack WordPress Vulnerability Report for advisory details.

Detection Methods for CVE-2025-30945

Indicators of Compromise

Unauthenticated HTTP requests to Taskbuilder plugin endpoints under /wp-admin/admin-ajax.php or plugin-specific REST routes
Anomalous access patterns to Taskbuilder actions from IP addresses without prior authenticated sessions
Web server logs showing repeated requests targeting Taskbuilder action parameters outside normal administrator workflows

Detection Strategies

Inventory WordPress sites and identify installations of the Taskbuilder plugin at version 4.0.7 or earlier
Review web server access logs for requests to Taskbuilder endpoints originating from unauthenticated sessions
Correlate plugin endpoint access with user session data to flag requests lacking valid authentication cookies

Monitoring Recommendations

Enable verbose logging on WordPress request handlers and forward logs to a centralized analytics platform
Alert on spikes in requests to plugin AJAX or REST endpoints outside expected administrative hours
Monitor for reconnaissance patterns such as sequential enumeration of plugin action parameters

How to Mitigate CVE-2025-30945

Immediate Actions Required

Identify all WordPress instances running Taskbuilder version 4.0.7 or earlier and prioritize them for remediation
Apply the vendor-provided update as soon as it is available for the affected plugin
Restrict network access to WordPress administrative endpoints where feasible until patching is complete

Patch Information

The vendor advisory tracked through Patchstack documents the broken access control issue. Site administrators should upgrade Taskbuilder to a version released after 4.0.7 that addresses the missing authorization check. Consult the Patchstack WordPress Vulnerability Report for the current fixed version and vendor guidance.

Workarounds

Deactivate and remove the Taskbuilder plugin from affected sites if an updated version is not yet available
Deploy a web application firewall (WAF) rule that blocks unauthenticated requests to Taskbuilder plugin endpoints
Restrict access to /wp-admin/admin-ajax.php through IP allowlisting for administrative networks where practical

bash

# Configuration example: WAF rule concept to block unauthenticated Taskbuilder AJAX actions
# Adapt syntax to your WAF platform (ModSecurity example)
SecRule REQUEST_URI "@contains /wp-admin/admin-ajax.php" \
  "chain,phase:2,deny,status:403,id:1030945,\
   msg:'Block unauthenticated Taskbuilder action - CVE-2025-30945'"
  SecRule ARGS:action "@rx ^taskbuilder_" \
    "chain"
    SecRule &REQUEST_COOKIES:/wordpress_logged_in_/ "@eq 0"