Server-Side Tracking Vulnerability in GTM Server Side Plugin by Stape.io
CVE-2026-55826

8.7HIGH

Key Information:

Vendor

WordPress
Status
Gtm-server-side-WordPress-plugin
Vendor
CVE Published:
23 October 2026

What is CVE-2026-55826?

The GTM Server Side plugin by stape.io is susceptible to a security flaw that allows unauthenticated attackers to access sensitive WooCommerce purchase event data. This vulnerability arises from the plugin's configuration, which inadvertently exposes another customer's complete order details, including personally identifiable information (PII), through the JavaScript dataLayer on WordPress sites. This issue affects all versions from 2.0.0 up to, but not including, 2.1.48. A patch has been implemented in version 2.1.48 to rectify this flaw.

Affected Version(s)

gtm-server-side-wordpress-plugin >= 2.0.0, < 2.1.48

References

https://github.com/stape-io/gtm-server-side-wordpress-plu...
x_refsource_CONFIRM
https://github.com/stape-io/gtm-server-side-wordpress-plu...
x_refsource_MISC
https://github.com/stape-io/gtm-server-side-wordpress-plu...
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.