CVE-2025-31923: CSS3 Accordions Auth Bypass Vulnerability

CVE-2025-31923 Overview

CVE-2025-31923 is a missing authorization vulnerability in the QuanticaLabs CSS3 Accordions for WordPress plugin. The flaw affects all plugin versions up to and including 3.0. It stems from incorrectly configured access control that allows authenticated users with low privileges to perform actions they should not be permitted to execute. The weakness is classified under [CWE-862] Missing Authorization.

Critical Impact
Authenticated attackers with low-level privileges can bypass access controls to affect the integrity and availability of the plugin's data over the network.

Affected Products

QuanticaLabs CSS3 Accordions for WordPress plugin
All versions from n/a through 3.0
WordPress installations running the vulnerable plugin

Discovery Timeline

2025-05-16 - CVE CVE-2025-31923 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-31923

Vulnerability Analysis

The vulnerability exists because the CSS3 Accordions plugin fails to enforce proper authorization checks on one or more of its exposed actions. WordPress plugins typically expose functionality through AJAX handlers, admin-post endpoints, or REST API routes. When these handlers omit capability checks such as current_user_can() or nonce validation, users with minimal privileges can invoke administrative operations.

An attacker holding any authenticated subscriber-level account can send crafted HTTP requests to the vulnerable endpoints. The server processes the request without validating whether the caller has permission to perform the operation, resulting in unauthorized state changes within the plugin.

Root Cause

The root cause is an access control gap described by [CWE-862] Missing Authorization. Plugin functions accessible over the network do not verify user capabilities before executing privileged logic. This class of flaw commonly appears when developers rely on the presence of an admin-only menu link rather than server-side capability enforcement.

Attack Vector

Exploitation requires network access to the WordPress site and a valid low-privilege account. The attacker sends HTTP POST or GET requests to the affected plugin endpoints with parameters chosen to modify accordion configurations or trigger administrative actions. No user interaction is required from an administrator. Successful requests result in limited integrity and availability impact on plugin data, per the CVSS vector.

No public proof-of-concept exploit is currently referenced in the enriched data. See the Patchstack WordPress Vulnerability Report for additional technical context.

Detection Methods for CVE-2025-31923

Indicators of Compromise

Unexpected modifications to CSS3 Accordions plugin settings, shortcodes, or stored content
HTTP requests from low-privilege authenticated users to admin-ajax.php referencing css3_accordions actions
New or altered accordion entries created outside of normal administrative workflows
Access log entries showing subscriber-level accounts issuing POST requests to plugin endpoints

Detection Strategies

Review WordPress access logs for authenticated requests to plugin AJAX or admin-post handlers originating from non-administrative accounts
Correlate user role data with request patterns to identify privilege boundary violations
Enable WordPress activity logging plugins to record plugin configuration changes and user actions
Compare current plugin settings against a known-good baseline to detect unauthorized changes

Monitoring Recommendations

Alert on HTTP 200 responses to plugin endpoints from subscriber or contributor role accounts
Track spikes in requests to wp-admin/admin-ajax.php with action parameters tied to the plugin
Monitor database changes to plugin-managed options and post meta rows for unauthorized writes

How to Mitigate CVE-2025-31923

Immediate Actions Required

Identify all WordPress sites running CSS3 Accordions for WordPress version 3.0 or earlier
Disable or uninstall the plugin until a patched release is confirmed available
Audit existing user accounts and revoke unnecessary low-privilege access
Rotate credentials for any accounts that may have been used to exploit the flaw

Patch Information

No fixed version is listed in the referenced advisory at the time of publication. Administrators should consult the Patchstack WordPress Vulnerability Report for the latest remediation guidance and monitor the QuanticaLabs vendor channel for a security release.

Workarounds

Deactivate the CSS3 Accordions plugin on affected WordPress installations
Restrict access to wp-admin/admin-ajax.php for non-administrative roles using a web application firewall rule
Limit new user registration and enforce the principle of least privilege on existing accounts
Apply virtual patching rules from a reputable WordPress security provider until an official fix ships

bash

# Example: disable the vulnerable plugin via WP-CLI
wp plugin deactivate css3-accordions-for-wordpress
wp plugin delete css3-accordions-for-wordpress