CVE-2025-31606 Overview
CVE-2025-31606 is a missing authorization vulnerability in the SP Blog Designer WordPress plugin developed by softpulseinfotech. The flaw affects all versions up to and including 1.0.0 and enables unauthenticated attackers to trigger arbitrary shortcode execution through incorrectly configured access control checks. The issue is categorized under [CWE-862] Missing Authorization. According to the Patchstack WordPress Vulnerability Report, the vulnerability allows arbitrary shortcode execution on affected WordPress sites, which can lead to limited disclosure of information and modification of site content.
Critical Impact
Unauthenticated network-based attackers can execute arbitrary WordPress shortcodes on affected sites, bypassing access control checks in the SP Blog Designer plugin.
Affected Products
- softpulseinfotech SP Blog Designer plugin for WordPress
- All versions from n/a through 1.0.0
- WordPress sites with the sp-blog-designer plugin installed and activated
Discovery Timeline
- 2025-03-31 - CVE-2025-31606 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-31606
Vulnerability Analysis
The SP Blog Designer plugin exposes functionality that executes WordPress shortcodes without properly validating whether the requester is authorized to invoke it. Because the shortcode handler lacks capability or nonce checks, an unauthenticated attacker can craft HTTP requests that cause the plugin to render arbitrary shortcodes registered on the site. Shortcodes in WordPress can perform actions ranging from embedding content to invoking backend logic exposed by other plugins. When arbitrary shortcode execution is possible, attackers can pivot to functionality intended only for administrators or authenticated users, resulting in limited confidentiality and integrity impact.
Root Cause
The root cause is a missing authorization check on a plugin endpoint that processes shortcode input. The handler does not verify user capabilities with current_user_can() or validate a nonce with check_ajax_referer() before passing input to do_shortcode(). This design flaw maps to [CWE-862] and is a common pattern in WordPress plugins where AJAX or REST endpoints are registered for both authenticated and unauthenticated users without gating server-side operations.
Attack Vector
Exploitation occurs over the network against the public-facing WordPress site. The attacker sends a crafted HTTP request to the vulnerable plugin endpoint with a shortcode payload in a controlled parameter. The server processes the shortcode with do_shortcode(), returning the resulting output or triggering downstream side effects. The attack complexity is high because it depends on which shortcodes are registered on the target site and what functionality those shortcodes expose. No user interaction or authentication is required.
See the Patchstack advisory for additional technical context.
Detection Methods for CVE-2025-31606
Indicators of Compromise
- Unexpected HTTP POST or GET requests to wp-admin/admin-ajax.php or plugin REST routes containing shortcode syntax such as [shortcode_name ...] in request parameters
- Access log entries showing unauthenticated requests targeting sp-blog-designer endpoints
- Anomalous plugin output rendered in server responses that references shortcodes not typically used on the front end
Detection Strategies
- Inspect web server access logs for requests to SP Blog Designer plugin paths originating from unauthenticated sessions
- Enable WordPress audit logging to record shortcode execution events and correlate them with source IP addresses
- Deploy a Web Application Firewall (WAF) rule that flags shortcode-like patterns inside request bodies destined for plugin AJAX handlers
Monitoring Recommendations
- Monitor for spikes in requests to admin-ajax.php with action parameters registered by the SP Blog Designer plugin
- Track outbound requests initiated by the WordPress host that could indicate abuse of shortcodes performing HTTP callbacks
- Alert on modifications to WordPress content, options, or user tables that occur shortly after suspicious plugin endpoint activity
How to Mitigate CVE-2025-31606
Immediate Actions Required
- Deactivate and remove the SP Blog Designer plugin on any site running version 1.0.0 or earlier until a patched release is available
- Restrict access to wp-admin/admin-ajax.php and plugin REST endpoints using WAF rules or IP allowlisting where feasible
- Audit the list of registered shortcodes on affected sites and disable any that expose sensitive functionality
Patch Information
At the time of the latest NVD update, no fixed version beyond 1.0.0 is listed in the advisory. Site administrators should monitor the Patchstack WordPress Vulnerability Report and the plugin's WordPress.org page for a patched release from softpulseinfotech.
Workarounds
- Uninstall the SP Blog Designer plugin and replace it with an actively maintained alternative that enforces authorization on shortcode handlers
- Deploy virtual patching via a WordPress security plugin or WAF that blocks unauthenticated requests to sp-blog-designer AJAX and REST endpoints
- Apply the principle of least privilege by disabling unused shortcodes and reviewing custom shortcodes for sensitive operations that must not be reachable without authentication
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
