CVE-2026-48868: Simple Shopping Cart IDOR Vulnerability

CVE-2026-48868 Overview

CVE-2026-48868 is an unauthenticated Insecure Direct Object Reference (IDOR) vulnerability affecting the WordPress Simple Shopping Cart plugin in versions up to and including 5.2.9. The flaw is classified under CWE-639 (Authorization Bypass Through User-Controlled Key). Attackers can manipulate object identifiers in requests to access resources belonging to other users without authentication. The vulnerability impacts confidentiality of stored shopping cart data and can expose sensitive order or customer information handled by the plugin.

Critical Impact
Remote unauthenticated attackers can access objects belonging to other users by tampering with identifiers in plugin requests, exposing confidential data without requiring credentials or user interaction.

Affected Products

WordPress Simple Shopping Cart plugin (also known as WordPress Simple PayPal Shopping Cart)
Plugin versions <= 5.2.9
WordPress sites using the plugin for storefront or PayPal checkout functionality

Discovery Timeline

2026-06-15 - CVE-2026-48868 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-48868

Vulnerability Analysis

The vulnerability is an Insecure Direct Object Reference in the Simple Shopping Cart plugin for WordPress. The plugin exposes endpoints that reference internal objects, such as cart or order identifiers, using values the client supplies. The application fails to verify whether the requesting user is authorized to access the referenced object. An unauthenticated attacker can iterate or guess identifiers to retrieve information tied to other users or sessions. The impact is limited to confidentiality, while integrity and availability are not affected by this flaw.

Root Cause

The root cause is missing authorization checks tied to user-controlled keys, the pattern captured by CWE-639. The plugin trusts client-supplied identifiers to retrieve cart or order data without validating ownership or session binding. Because the affected endpoint is reachable without authentication, the access control gap is fully exposed to the network.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. An attacker sends crafted HTTP requests to the plugin endpoint, substituting object identifiers belonging to other users. Successful requests return data the attacker would not normally be authorized to view. Enumeration of sequential identifiers can amplify the impact by enabling bulk extraction of cart or order records.

No verified public proof-of-concept code is available. Refer to the Patchstack Vulnerability Report for technical details.

Detection Methods for CVE-2026-48868

Indicators of Compromise

Unauthenticated HTTP requests to Simple Shopping Cart plugin endpoints containing sequentially varying object identifiers in query string or POST parameters.
Spikes in 200 OK responses to plugin endpoints from a single source IP without an associated session cookie.
Web server access logs showing repeated parameter enumeration patterns against /wp-content/plugins/wordpress-simple-paypal-shopping-cart/ paths.

Detection Strategies

Inspect WordPress access logs for high-frequency, low-variance requests to plugin endpoints that reference numeric or hashed object identifiers.
Deploy web application firewall (WAF) rules that flag parameter tampering and enumeration behavior against the affected plugin paths.
Correlate unauthenticated requests returning sensitive data fields, such as email addresses or order totals, with the originating IP and user agent.

Monitoring Recommendations

Monitor outbound data volumes from the WordPress host for anomalous response sizes tied to plugin endpoints.
Alert on rapid sequential access to distinct identifier values within a short time window.
Track plugin version inventory across managed WordPress installations to confirm exposure status.

How to Mitigate CVE-2026-48868

Immediate Actions Required

Update the Simple Shopping Cart plugin to a version newer than 5.2.9 once the vendor publishes a fixed release.
Audit logs for prior unauthenticated access attempts against plugin endpoints and identify any exposed customer data.
Restrict access to the WordPress site at the network edge while patch validation is in progress.

Patch Information

Review the Patchstack Vulnerability Report for current fixed-version guidance and confirm the installed plugin build against the vendor advisory before returning the site to production.

Workarounds

Deploy WAF signatures that block enumeration of identifier parameters on Simple Shopping Cart endpoints.
Disable or remove the plugin if it is not in active use until a patched version is available.
Place plugin endpoints behind authentication or IP allowlists where business workflows permit.

bash

# Example WAF rule snippet (ModSecurity) to throttle enumeration
SecRule REQUEST_URI "@contains /wp-content/plugins/wordpress-simple-paypal-shopping-cart/" \
  "id:1004868,phase:1,deny,status:429,\
   msg:'Possible IDOR enumeration against Simple Shopping Cart (CVE-2026-48868)',\
   chain"
  SecRule IP:REQ_COUNT "@gt 30"