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OpenAdvisories
High · 8.7 CVE-2026-55826 EUVD-2026-108976

Customer Order Data Exposed via Unauthenticated gtm_server_side_order_id Cookie Manipulation in GTM Server Side WordPress Plugin

Published Oct 23, 2026 · Updated Oct 29, 2026 · Assigned by GitHub_M

Description

The GTM Server Side plugin by stape.io implements server-side tracking on WordPress websites. From version 2.0.0 to before version 2.1.48, the WooCommerce purchase event tracking mechanism allows an unauthenticated attacker to trigger the rendering of another customer's full order data — including personally identifiable information (PII) — into the page's JavaScript dataLayer. This issue has been patched in version 2.1.48.

Affected products

VendorProductAffectedFixed
stape-io gtm-server-side-wordpress-plugin >= 2.0.0, < 2.1.48 —

References