CVE-2025-31390: Social Crowd CSRF Vulnerability

CVE-2025-31390 Overview

CVE-2025-31390 is a Cross-Site Request Forgery (CSRF) vulnerability in the bdoga Social Crowd WordPress plugin that enables Stored Cross-Site Scripting (XSS). The flaw affects all versions of Social Crowd up to and including 0.9.6.1. An attacker can craft a malicious request that, when triggered by an authenticated administrator, persists attacker-controlled JavaScript into plugin-managed content. The stored payload then executes in the browsers of subsequent site visitors or administrators.

Critical Impact

Successful exploitation chains CSRF with Stored XSS, allowing attackers to inject persistent JavaScript into a WordPress site through a single administrator visit to a crafted page, leading to session theft, account takeover, or further site compromise.

Affected Products

• bdoga Social Crowd plugin for WordPress, versions up to and including 0.9.6.1
• WordPress sites with the Social Crowd plugin installed and active
• Administrator accounts with active sessions on vulnerable installations

Discovery Timeline

• 2025-04-09 - CVE-2025-31390 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-31390

Vulnerability Analysis

The vulnerability stems from missing or improperly validated anti-CSRF tokens on plugin endpoints that update stored content. Without nonce verification, the plugin accepts state-changing requests originating from any external context, provided a privileged user's browser carries valid authentication cookies.

The flaw is classified under [CWE-352] Cross-Site Request Forgery. Because the affected handler also fails to sanitize submitted input before storage, the resulting CSRF primitive escalates into Stored XSS. Attacker-supplied JavaScript is written to the database and rendered in subsequent page loads.

The attack requires user interaction, as exploitation depends on tricking an authenticated user into visiting a malicious page. The scope is changed because injected scripts execute in the WordPress admin or front-end origin, affecting resources beyond the vulnerable component itself.

Root Cause

The root cause is the absence of WordPress nonce validation (wp_verify_nonce or check_admin_referer) on plugin request handlers, combined with insufficient output encoding and input sanitization on the affected fields. These two weaknesses compound: CSRF allows an unauthenticated remote attacker to issue privileged requests, and missing sanitization allows those requests to plant persistent script payloads.

Attack Vector

An attacker hosts a webpage containing a forged form or fetch() request targeting a vulnerable Social Crowd endpoint. When a logged-in WordPress administrator visits this page, their browser submits the forged request with valid session cookies. The plugin processes the request and stores the malicious payload. Any subsequent visitor rendering the affected component executes the injected script in their session context. Refer to the Patchstack Vulnerability Advisory for additional technical context.

Detection Methods for CVE-2025-31390

Indicators of Compromise

• Unexpected <script>, onerror, or onload strings in Social Crowd plugin database entries within the wp_options or plugin-specific tables
• HTTP POST requests to Social Crowd admin endpoints with Referer headers pointing to unrelated external domains
• Administrator sessions generating plugin configuration changes without corresponding admin UI navigation in access logs
• New or modified WordPress administrator accounts created shortly after a suspected exploitation event

Detection Strategies

• Inspect the WordPress database for plugin-stored content containing HTML or JavaScript syntax that should not appear in legitimate configuration values
• Review web server access logs for POST requests to /wp-admin/ endpoints handled by the Social Crowd plugin with off-site referrers
• Deploy a Web Application Firewall rule that flags state-changing requests to the plugin lacking valid _wpnonce parameters

Monitoring Recommendations

• Continuously monitor WordPress plugin file integrity and database content for unauthorized modifications
• Alert on outbound requests from administrator browsers to unfamiliar domains, which may indicate stored XSS exfiltration
• Track plugin version inventory across managed WordPress instances to confirm patched releases are deployed

How to Mitigate CVE-2025-31390

Immediate Actions Required

• Update the Social Crowd plugin to a version newer than 0.9.6.1 if available, or deactivate and remove the plugin until a fix is released
• Audit all stored plugin content and remove any entries containing script tags or HTML event handlers
• Force a password reset and session invalidation for all WordPress administrator accounts on affected sites

Patch Information

At the time of NVD publication, the vendor advisory tracked by Patchstack indicates the issue affects Social Crowd through 0.9.6.1 with no fixed version listed. Site operators should consult the Patchstack Vulnerability Advisory for the latest remediation status and deactivate the plugin if no patched release is available.

Workarounds

• Deactivate the Social Crowd plugin until a vendor patch is published
• Restrict WordPress administrator access to a dedicated browser profile that is not used for general web browsing
• Apply a WAF rule that enforces same-origin Referer and Origin headers on all /wp-admin/ POST requests
• Implement Content Security Policy headers that block inline script execution to limit Stored XSS impact

# Example: deactivate the vulnerable plugin via WP-CLI
wp plugin deactivate social-crowd
wp plugin delete social-crowd