CVE-2025-31846 Overview
CVE-2025-31846 is a missing authorization vulnerability in the Jeroen Schmit Theater for WordPress plugin (theatre). The flaw stems from incorrectly configured access control security levels, allowing authenticated users with low privileges to perform actions that should be restricted. The issue affects all plugin versions up to and including 0.18.7. The vulnerability is categorized under [CWE-862] Missing Authorization.
Critical Impact
Authenticated attackers with low-level privileges can bypass access control checks and modify plugin-managed data, impacting integrity of WordPress sites running the Theater for WordPress plugin.
Affected Products
- Jeroen Schmit Theater for WordPress plugin (theatre)
- Versions from n/a through 0.18.7
- WordPress sites with the plugin activated
Discovery Timeline
- 2025-04-01 - CVE-2025-31846 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-31846
Vulnerability Analysis
The Theater for WordPress plugin exposes functionality that lacks proper authorization checks on sensitive operations. An authenticated user with minimal privileges can invoke these endpoints and perform actions reserved for higher-privileged roles. The vulnerability results from the plugin failing to validate the caller's capability before executing privileged logic.
Successful exploitation produces limited integrity impact without compromising confidentiality or availability. The attack requires network access and valid low-privilege credentials, with no user interaction needed. For additional technical context, see the Patchstack WordPress Plugin Vulnerability advisory.
Root Cause
The plugin's handlers do not enforce WordPress capability checks such as current_user_can() or verify nonces before executing state-changing operations. This gap in authorization logic maps directly to [CWE-862] Missing Authorization. Any authenticated session, including subscriber-level accounts on sites allowing open registration, can reach the vulnerable code paths.
Attack Vector
An attacker authenticates to the target WordPress site using any valid account. The attacker then issues HTTP requests to the plugin's unprotected endpoints. The server processes the request without confirming the caller's role or capabilities, carrying out actions that should require elevated permissions. No social engineering or victim interaction is required.
No verified public proof-of-concept code is available. The vulnerability mechanism is described in prose per the referenced Patchstack advisory.
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Stop Identity AttacksDetection Methods for CVE-2025-31846
Indicators of Compromise
- Unexpected modifications to Theater for WordPress plugin data, including events, productions, or configuration entries
- WordPress audit log entries showing low-privileged accounts invoking plugin-specific actions or AJAX endpoints
- HTTP POST requests to admin-ajax.php or plugin REST routes originating from subscriber or contributor accounts
Detection Strategies
- Monitor WordPress access logs for requests to wp-admin/admin-ajax.php referencing theatre plugin actions from non-administrator sessions
- Review the wp_options and plugin-managed custom post types for unauthorized changes
- Deploy a WordPress security plugin or Web Application Firewall (WAF) rule to log plugin endpoint access and flag privilege anomalies
Monitoring Recommendations
- Enable detailed WordPress activity logging that captures user ID, role, and target endpoint for all plugin interactions
- Alert on new or modified entries created by accounts without editor or administrator roles
- Track plugin version across the environment and flag any sites running theatre version 0.18.7 or earlier
How to Mitigate CVE-2025-31846
Immediate Actions Required
- Update the Theater for WordPress plugin to a version released after 0.18.7 that addresses the authorization gap
- Audit existing user accounts and remove unused or untrusted low-privilege accounts
- Disable open user registration on the WordPress site if not required for business operations
Patch Information
Consult the Patchstack advisory for the current patched version. Apply the plugin update through the WordPress admin dashboard or via WP-CLI. Verify the installed version after update to confirm remediation.
Workarounds
- Deactivate the Theater for WordPress plugin until a patched version is installed
- Restrict access to wp-admin/admin-ajax.php and plugin REST endpoints at the WAF layer for non-administrator users
- Apply virtual patching through a WordPress security plugin that enforces capability checks on vulnerable endpoints
# Update Theater for WordPress plugin via WP-CLI
wp plugin update theatre
# Verify installed version
wp plugin get theatre --field=version
# Temporarily deactivate the plugin if a patch is unavailable
wp plugin deactivate theatre
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
