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CVE-2026-87091— Welcart e-Commerce <= 2.12.2 - Unauthenticated Stored Cross-Site Scripting via Settlement Notification Parameters

Quick assessment

Affected
uscnanbu Welcart e-Commerce
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 Welcart e-Commerce 插件在所有版本中（包括 2.12.2 及之前版本）都存在存储型跨站脚本（Stored Cross-Site Scripting, XSS）漏洞，该漏洞源于结算通知参数在处理时缺乏充分的输入净化与输出转义。这使得未认证的攻击者能够在网页中注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本将被执行。 该漏洞涉及的 IPN（即时支付通知）端点接受 和 参数，但未进行任何身份验证、Nonce（一次性令牌）验证或签名校验。因此，任何未认证的攻击者均可直接提

CVSS 7.2 · High EPSS 0.31% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
uscnanbu Welcart e-Commerce ≤ 2.12.2 affected
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I. Basic Information for CVE-2026-87091

Vulnerability Information
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Vulnerability Title
Welcart e-Commerce <= 2.12.2 - Unauthenticated Stored Cross-Site Scripting via Settlement Notification Parameters
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
uscnanbu Welcart e-Commerce 0 ~ 2.12.2 -

II. Public POCs for CVE-2026-87091

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III. Intelligence Information for CVE-2026-87091

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Patches & Fixes for CVE-2026-87091 (2)

Vendor Advisories for CVE-2026-87091 (1)

IV. Related Vulnerabilities

Same product: Welcart e-Commerce
Same vendor: uscnanbu
Same weakness: CWE-79

V. Comments for CVE-2026-87091

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