CVE-2026-55826GHSA-j5j2-gr8c-8rvf
gtm-server-side-wordpress-plugin: Customer Order Data Exposed via Unauthenticated gtm_server_side_order_id Cookie Manipulation in GTM Server Side WordPress Plugin
stape-io gtm-server-side-wordpress-pluginApplications & CMS
CVSS
8.7HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 1
- gtm-server-side-wordpress-pluginaffected: >= 2.0.0, < 2.1.48CVE List
References 5
- github.com/stape-io/gtm-server-side-wordpress-plugin/commit/702898f57772279ca63d3f800336c1803103ea41Fixvia CVE List
- github.com/stape-io/gtm-server-side-wordpress-plugin/commit/9ff46a050028c40fad5416f2fa35be574c823434Fixvia CVE List
- github.com/stape-io/gtm-server-side-wordpress-plugin/releases/tag/2.1.48Fixvia CVE List
- github.com/stape-io/gtm-server-side-wordpress-plugin/security/advisories/GHSA-j5j2-gr8c-8rvfAdvisoryvia CVE List
- github.com/stape-io/gtm-server-side-wordpress-plugin/tree/v2.1.48Referencevia CVE List