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CVE-2026-19887— Welcart e-Commerce <= 2.12.1 - Unauthenticated Arbitrary File Deletion via PHP Object Injection via 'reserve' Checkout Parameter and 'option' EDY Callback

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 电商插件在所有版本中（包括 2.12.1 及更早版本）均存在 PHP 对象注入漏洞。该漏洞通过 Telecom EDY 支付回调函数（ ）中反序列化不可信输入而触发。未认证的 attackers 可以在公开结账过程中存储任意“reserve”键值对作为订单元数据，然后通过攻击者选择的“option”参数调用该回调函数，从而选择并反序列化这些元数据，且无需验证提供者签名、源地址、交易标识或所有权。由于插件自身捆绑的 TCPDF 库中已存在现成的 POP（属性覆盖/属性链）链，因

CVSS 8.8 · High
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I. Basic Information for CVE-2026-19887

Vulnerability Information
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Vulnerability Title
Welcart e-Commerce <= 2.12.1 - Unauthenticated Arbitrary File Deletion via PHP Object Injection via 'reserve' Checkout Parameter and 'option' EDY Callback
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
uscnanbu Welcart e-Commerce 0 ~ 2.12.1 -

II. Public POCs for CVE-2026-19887

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III. Intelligence Information for CVE-2026-19887

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Patches & Fixes for CVE-2026-19887 (3)

Proof of Concept for CVE-2026-19887 (1)

Vendor Pages for CVE-2026-19887 (1)

Other References for CVE-2026-19887 (2)

IV. Related Vulnerabilities

Same product: Welcart e-Commerce
Same vendor: uscnanbu
Same weakness: CWE-502

V. Comments for CVE-2026-19887

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