CVE-2026-87091High· 7.2▾ Twilight

The Welcart e-Commerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Settlement Notification Parameters in all versions up to, and including, 2.12.2 due to insufficient input sanitization and output escaping

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score40/ 100 · Moderate

impact 39.6 · likelihood 0 · exploitation 0

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Proof of concept

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Published

Oct 3, 2026

Updated

Oct 3, 2026

CVSS

7.2

Vendor

uscnanbu

Product

Welcart e-Commerce

CWE

CWE-79

Depth score

40 · Moderate

EPSS

—

Platforms

—

Source

NVD

Vector

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

uscnanbu CWE-79 #nvd #cve.org

Affected

welcart_e-commerce <= 2.12.2

Full technical detail▾

Overview

The Welcart e-Commerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Settlement Notification Parameters in all versions up to, and including, 2.12.2 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 IPN endpoint accepts the 'rel' and 'option' parameters with no authentication, nonce validation, or signature verification, meaning any unauthenticated attacker can directly submit malicious payloads that are stored and later rendered in the administrator's settlement error log view.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org