CVE-2025-31420 Overview
CVE-2025-31420 is an Incorrect Privilege Assignment vulnerability in the Tomdever wpForo Forum plugin for WordPress. The issue affects all wpForo Forum versions up to and including 2.4.2. The flaw is categorized under [CWE-266] Incorrect Privilege Assignment and enables Privilege Escalation against affected WordPress sites running the plugin.
An authenticated attacker with low-level forum privileges can leverage the weakness to obtain elevated rights. Exploitation occurs over the network and requires no user interaction. The vulnerability primarily threatens the integrity of WordPress installations that expose wpForo to registered users.
Critical Impact
An authenticated low-privileged attacker can escalate privileges within a WordPress site running wpForo Forum 2.4.2 or earlier, gaining the ability to modify forum content and configuration beyond their intended role.
Affected Products
- Tomdever wpForo Forum plugin for WordPress
- wpForo Forum versions through 2.4.2
- WordPress sites with wpForo installed and user registration enabled
Discovery Timeline
- 2025-04-04 - CVE-2025-31420 published to the National Vulnerability Database
- 2026-04-29 - Last updated in NVD database
Technical Details for CVE-2025-31420
Vulnerability Analysis
The vulnerability stems from incorrect privilege assignment within the wpForo Forum plugin codebase. The plugin assigns capabilities or role-based permissions in a way that allows a lower-privileged authenticated user to gain rights reserved for higher roles. The flaw maps to [CWE-266] Incorrect Privilege Assignment.
Exploitation is network-accessible and requires only low-level authenticated access, such as a standard registered forum user account. No user interaction is needed to trigger the privilege escalation path. The result is high integrity impact, with limited confidentiality and availability impact, reflecting the attacker's ability to alter forum-controlled data.
According to the Patchstack Vulnerability Report, the issue affects wpForo Forum through version 2.4.2. The current EPSS probability is 0.221% at the 44.7 percentile, indicating limited observed exploitation activity at this time.
Root Cause
The root cause is improper enforcement of role separation in the plugin's privilege assignment logic. When a lower-privileged user performs a specific action, the plugin grants capabilities outside the boundaries defined by their assigned forum role. The plugin does not consistently validate the requester's effective WordPress role against the action being performed.
Attack Vector
An attacker registers or controls a low-privileged WordPress account on a site running wpForo Forum 2.4.2 or earlier. The attacker then issues network requests to the vulnerable plugin endpoint that triggers the incorrect privilege assignment. After successful exploitation, the attacker can perform actions reserved for higher-privileged forum or site roles, including modifying forum content and configuration.
No verified public exploit code is currently available. Technical details of the exploitation path are documented in the Patchstack Vulnerability Report.
Detection Methods for CVE-2025-31420
Indicators of Compromise
- Unexpected role or capability changes on WordPress user accounts associated with wpForo Forum activity.
- New administrator or moderator accounts created by users who previously held only subscriber or basic forum roles.
- Modifications to wpForo forum settings, boards, or moderation rules made by accounts that should not have such permissions.
- Anomalous HTTP POST requests to wpForo plugin endpoints originating from low-privileged authenticated sessions.
Detection Strategies
- Audit the wp_usermeta and wp_users tables for unexpected wp_capabilities changes correlated with wpForo activity.
- Review WordPress and web server access logs for repeated requests to wpForo administrative or AJAX endpoints from non-administrator accounts.
- Compare current user role assignments against a known-good baseline to identify unauthorized escalations.
- Enable WordPress activity logging plugins to track role changes, profile updates, and privilege-sensitive actions in real time.
Monitoring Recommendations
- Forward WordPress application logs and web server access logs to a centralized SIEM for correlation and alerting on privilege change events.
- Alert on creation of new administrator accounts or capability promotions outside normal change windows.
- Monitor the installed version of wpForo Forum across managed WordPress sites and flag any instance at or below version 2.4.2.
How to Mitigate CVE-2025-31420
Immediate Actions Required
- Update the wpForo Forum plugin to a version later than 2.4.2 as soon as a fixed release is available from the vendor.
- Audit all WordPress user accounts and revert any role or capability changes that cannot be tied to a legitimate administrative action.
- Temporarily restrict new user registration on WordPress sites running affected wpForo versions until patching is complete.
- Rotate credentials for any accounts that may have been escalated or accessed by unauthorized users.
Patch Information
Refer to the Patchstack Vulnerability Report for the latest fix status and vendor advisory updates. Apply the upgrade through the WordPress plugin manager or by replacing the plugin files with the patched version.
Workarounds
- Disable the wpForo Forum plugin on affected WordPress installations until a patched version is applied.
- Restrict access to wpForo plugin endpoints at the web application firewall (WAF) layer for non-administrative users.
- Enforce least privilege by reviewing custom forum roles and removing unnecessary capabilities granted to subscriber-level accounts.
# Check installed wpForo plugin version on a WordPress site
wp plugin get wpforo --field=version
# Deactivate the plugin until a patch is available
wp plugin deactivate wpforo
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
