CVE-2026-52694: WooCommerce Data Exposure Vulnerability

CVE-2026-52694 Overview

CVE-2026-52694 is an unauthenticated sensitive data exposure vulnerability in the Signature Add-On for WooCommerce WordPress plugin. The flaw affects all versions up to and including 2.0. Remote attackers can access sensitive information without authentication or user interaction over the network. The weakness is classified under [CWE-497], exposure of sensitive system information to an unauthorized control sphere. Because WooCommerce stores often handle customer contracts, agreements, and signed documents, exposed signature data can include personally identifiable information tied to transactions.

Critical Impact
Unauthenticated remote attackers can retrieve sensitive signature data from affected WooCommerce stores without credentials or user interaction.

Affected Products

Signature Add-On for WooCommerce plugin versions <= 2.0
WordPress sites running the woocommerce-digital-signature plugin
WooCommerce deployments that rely on the plugin for customer signature capture

Discovery Timeline

2026-06-15 - CVE-2026-52694 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-52694

Vulnerability Analysis

The vulnerability allows unauthenticated network-based access to sensitive data managed by the Signature Add-On for WooCommerce plugin. An attacker requires no privileges and no user interaction to retrieve information that should remain restricted. The plugin processes digital signatures collected during WooCommerce checkout or order workflows. When access controls are absent or improperly enforced, signature artifacts and associated order metadata become reachable through plugin endpoints. The EPSS probability is 0.245%, indicating limited current exploitation telemetry, but the unauthenticated network reach makes opportunistic scanning likely once details circulate.

Root Cause

The root cause is improper restriction of access to sensitive resources, consistent with [CWE-497]. The plugin exposes signature-related data through endpoints that fail to require authentication or capability checks. WordPress plugins typically enforce access through current_user_can() or nonce validation on AJAX and REST handlers. The vulnerable code paths in versions <= 2.0 lack these guards, allowing direct retrieval by remote callers.

Attack Vector

An attacker sends crafted HTTP requests to the plugin's exposed endpoints on a target WordPress site. No session, cookie, or token is required. The response returns signature data or related order context that should be limited to administrators or order owners. Mass scanning of WooCommerce sites running the plugin enables bulk harvesting of customer signature data. Refer to the Patchstack WooCommerce Vulnerability Advisory for advisory-level technical context.

Detection Methods for CVE-2026-52694

Indicators of Compromise

Unauthenticated HTTP GET or POST requests to woocommerce-digital-signature plugin endpoints under /wp-admin/admin-ajax.php or /wp-json/
Anomalous outbound transfer volumes from wp-content/uploads/ paths storing signature images
Repeated access from a single source IP to plugin-specific query parameters or REST routes

Detection Strategies

Inspect web server access logs for requests targeting the woocommerce-digital-signature plugin slug from unauthenticated sessions
Deploy a WordPress security plugin or web application firewall rule that flags access to signature-handling endpoints without an authenticated cookie
Compare baseline traffic patterns against current request volumes for plugin-specific URIs

Monitoring Recommendations

Enable WordPress audit logging for plugin REST and AJAX endpoint access
Forward web server and WordPress logs to a centralized analytics platform for correlation across sites
Alert on any successful HTTP 200 responses to plugin endpoints originating from unauthenticated clients

How to Mitigate CVE-2026-52694

Immediate Actions Required

Identify all WordPress sites running the Signature Add-On for WooCommerce plugin at version 2.0 or earlier
Deactivate the plugin until a patched version is confirmed available and installed
Review recent web server logs for prior unauthenticated access to plugin endpoints and notify affected customers if data exposure is confirmed

Patch Information

No fixed version is referenced in the published advisory data. Monitor the Patchstack WooCommerce Vulnerability Advisory and the plugin's WordPress.org listing for an update beyond version 2.0. Apply the patched release across all WooCommerce sites once published.

Workarounds

Block public access to the plugin's AJAX and REST endpoints using web application firewall rules until a patch is applied
Restrict access to /wp-json/ routes that reference the signature plugin to authenticated administrative IP ranges
Remove the plugin entirely if signature capture is not a current business requirement

bash

# Example WAF rule to block unauthenticated access to plugin endpoints
SecRule REQUEST_URI "@contains woocommerce-digital-signature" \
    "id:1052694,phase:1,deny,status:403,\
    msg:'Block unauthenticated access to Signature Add-On for WooCommerce'"