Welcart guest checkout permits stored cross-site scripting against administrators

Welcart e-Commerce through 2.12.1 insufficiently sanitizes and escapes the custom_order value submitted through guest checkout. An unauthenticated attacker can store script in an order, and the payload executes when an administrator views that order in WordPress administration.

CVE / CNA score 7.2 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 01, 2026
Weakness: CWE-79 — Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

This CVE was published Sep 01, 2026 and is one of 18 known issues for this plugin.

What to do

Update, patch or deactivate.

Update to a confirmed release newer than 2.12.1 when available. Until then, restrict or disable the affected guest-checkout field when warranted, inspect order data for malicious values, and invalidate privileged sessions if affected orders were viewed.

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 Stored Cross-Site Scripting via the 'custom_order' parameter in all versions up to, and including, 2.12.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload is delivered via the guest checkout form, requiring no authentication, and executes when an administrator views the affected order in the WordPress admin panel.

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

References

Primary and upstream sources

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