CVE-2025-57926 PoC — WordPress plugin Passster 跨站脚本漏洞

Source

https://github.com/quetuan03/CVE-2025-57926

Associated Vulnerability

Title:WordPress plugin Passster 跨站脚本漏洞 (CVE-2025-57926)
Description:WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Passster 4.2.18及之前版本存在跨站脚本漏洞，该漏洞源于输入中和不当，可能导致存储型跨站脚本攻击。

Description

WordPress Passster Plugin <= 4.2.18 is vulnerable to Cross Site Scripting (XSS)

Readme

Sink: According to the mechanism of WordPress Core, XSS is prevented in post content, but with this plugin, the content is encoded and then decoded when rendered, unintentionally creating an XSS vulnerability."
<img width="1263" height="710" alt="image" src="https://github.com/user-attachments/assets/09e7c151-a688-4f72-b053-782b950412f5" />
<img width="1411" height="711" alt="image" src="https://github.com/user-attachments/assets/174e9605-a4bb-4915-8ca6-2ce41443dfde" />

PoC: The base64 encoded payload <script>alert(1)</script> is PHNjcmlwdD5hbGVydCgxKTwvc2NyaXB0Pg==
<img width="1848" height="846" alt="image" src="https://github.com/user-attachments/assets/8887508a-9ffb-472c-9c57-8a4af9a82527" />
<img width="1844" height="953" alt="image" src="https://github.com/user-attachments/assets/848d754d-96dc-4436-91cf-f5a3cccd91ba" />

File Snapshot


 [4.0K]  /data/pocs/e0b0f9950321d5c42bf2b4155a79f081723fff63
└── [ 840]  README.md

1 directory, 1 file

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