WordPress security changelog
HIGH CVE-2026-19887 Deferred

Welcart permits unauthenticated object injection through its Telecom EDY callback

Welcart through 2.12.1 lets an unauthenticated buyer store arbitrary reserve metadata during checkout, then select and unserialize it through the usces_action_acting_transaction Telecom EDY callback without provider, transaction, source-address, or ownership validation. Its bundled TCPDF library supplies a POP chain for arbitrary file deletion; when an administrator prints an invoice, deletion of wp-config.php can enable site reinstallation and code execution.

CVE / CNA score 8.8 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
Welcart e-Commerce
Plugin slug
usc-e-shop
Affected
<= 2.12.1
Safe version
See mitigation notes
Published
Sep 05, 2026
Weakness
CWE-502 — Deserialization of Untrusted Data

This CVE was published Sep 05, 2026 and is one of 18 known issues for this plugin.

What to do

Update, patch or deactivate.

Welcart 2.12.2 is available and may resolve the issue, but its official changelog does not confirm this CVE. Update conservatively, disable the affected Telecom EDY flow until remediation is confirmed, and investigate unexpected order metadata, invoice activity, file deletion, or installer access.

No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

The Welcart e-Commerce plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.12.1 via deserialization of untrusted input in the Telecom EDY payment callback (usces_action_acting_transaction). Unauthenticated attackers can store arbitrary 'reserve' key/value pairs as order metadata during a public checkout, then invoke the callback with an attacker-chosen 'option' parameter to select and unserialize that metadata without any provider signature, source-address, transaction-identity or ownership check. A POP chain is present in the TCPDF library bundled with the plugin itself, so no additional plugin or theme is required. This makes it possible for unauthenticated attackers to delete arbitrary files on the server, including wp-config.php, which can lead to remote code execution when an attacker re-runs the WordPress installer against a database they control. Successful exploitation is contingent on an admin printing an invoice to trigger file deletion.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Primary and upstream sources