CVE-2026-65434 Overview
CVE-2026-65434 is a sensitive data exposure vulnerability affecting the ЮKassa для WooCommerce WordPress plugin in versions <= 2.16.1. The flaw allows authenticated users with the Subscriber role to access sensitive information they should not be authorized to view. The weakness is classified under CWE-201: Insertion of Sensitive Information Into Sent Data. Because the plugin integrates with WooCommerce payment workflows, exposed data may include order or transaction details processed by the ЮKassa payment gateway. Exploitation requires only low-privileged authentication over the network and no user interaction.
Critical Impact
Authenticated subscribers can retrieve sensitive WooCommerce payment data from vulnerable ЮKassa для WooCommerce installations without additional privileges.
Affected Products
- ЮKassa для WooCommerce WordPress plugin versions <= 2.16.1
- WordPress sites running WooCommerce with the ЮKassa payment integration
- Deployments processing customer transactions through the ЮKassa gateway
Discovery Timeline
- 2026-07-27 - CVE-2026-65434 published to NVD
- 2026-07-27 - Last updated in NVD database
Technical Details for CVE-2026-65434
Vulnerability Analysis
The vulnerability arises from insufficient access control on plugin endpoints or data returned to authenticated sessions. The plugin exposes sensitive information to users whose role should not permit visibility of that data. In WordPress, the Subscriber role is the lowest authenticated tier and is often granted automatically through open registration. An attacker who registers a Subscriber account can query the affected functionality and receive data intended for administrators or shop managers. According to the Patchstack Vulnerability Advisory, the issue affects the plugin's data handling paths that fail to enforce role-based restrictions.
Root Cause
The root cause is missing or incorrect authorization checks on plugin routes that return payment or configuration data. The plugin trusts authentication alone and does not verify that the calling user has an appropriate capability such as manage_woocommerce or manage_options. This deviates from the WordPress and WooCommerce guidance that every privileged endpoint must call current_user_can() with a capability appropriate for the data being returned.
Attack Vector
Exploitation is remote and requires a Subscriber-level account on the target WordPress site. The attacker authenticates, then issues requests to the plugin's exposed endpoints. The server returns sensitive data without validating role or capability. Confidentiality impact is high, while integrity and availability are unaffected. Sites that allow public user registration are at elevated risk because attackers can self-provision the required account.
No verified proof-of-concept code is publicly available. See the Patchstack advisory for further technical details.
Detection Methods for CVE-2026-65434
Indicators of Compromise
- Unexpected requests from Subscriber-role sessions to ЮKassa or WooCommerce plugin endpoints
- Access log entries showing low-privileged users retrieving admin-context resources
- Spikes in new Subscriber account registrations followed by plugin endpoint activity
Detection Strategies
- Audit WordPress access logs for requests to /wp-admin/admin-ajax.php and REST routes referencing yookassa from non-administrative users
- Review the WordPress user table for recently created Subscriber accounts on sites with open registration
- Correlate authenticated session identifiers with requests returning payment-related response bodies
Monitoring Recommendations
- Enable verbose logging on the WordPress and WooCommerce audit plane and forward events to a centralized SIEM
- Alert on any Subscriber-role account issuing requests to plugin administrative endpoints
- Monitor outbound data volumes from the WordPress host for anomalies consistent with bulk data retrieval
How to Mitigate CVE-2026-65434
Immediate Actions Required
- Update the ЮKassa для WooCommerce plugin to a version later than 2.16.1 once a fixed release is available from the vendor
- Disable open user registration on WooCommerce sites that do not require it
- Audit existing Subscriber accounts and remove unrecognized users
Patch Information
Refer to the Patchstack Vulnerability Advisory for the latest patch status and vendor guidance. Administrators should verify the installed plugin version through the WordPress admin console and apply updates through the standard plugin update workflow.
Workarounds
- Restrict access to the plugin's endpoints at the web server or WAF layer until a patched version is installed
- Set WordPress users_can_register to false to prevent unauthenticated attackers from provisioning Subscriber accounts
- Deploy a virtual patch through a WordPress security plugin or reverse proxy that blocks the vulnerable endpoints
# Disable open registration via wp-cli
wp option update users_can_register 0
# List Subscriber accounts for review
wp user list --role=subscriber --fields=ID,user_login,user_email,user_registered
# Force update the plugin once a fixed release is published
wp plugin update yookassa
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
