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CVE-2021-4074— WHMCS Bridge <= 6.1 Subscriber+ Stored Cross-Site Scripting

Quick assessment

Affected
WHMCS Bridge WHMCS Bridge
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 plugin是WordPress开源的一个应用插件。 WordPress plugin WHMCS Bridge 插件存在跨站脚本漏洞，攻击者可通过 ~/whmcs-bridge/bridge_cp.php 文件中的 cc_whmcs_bridge_url 参数注入任意 Web 脚本。

CVSS 6.4 · Medium EPSS 0.56% · P44
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I. Basic Information for CVE-2021-4074

Vulnerability Information
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Vulnerability Title
WHMCS Bridge <= 6.1 Subscriber+ Stored Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
The WHMCS Bridge WordPress plugin is vulnerable to Stored Cross-Site Scripting via the cc_whmcs_bridge_url parameter found in the ~/whmcs-bridge/bridge_cp.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 6.1. Due to missing authorization checks on the cc_whmcs_bridge_add_admin function, low-level authenticated users such as subscribers can exploit this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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
Vulnerability Title
WordPress plugin 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress plugin是WordPress开源的一个应用插件。 WordPress plugin WHMCS Bridge 插件存在跨站脚本漏洞，攻击者可通过 ~/whmcs-bridge/bridge_cp.php 文件中的 cc_whmcs_bridge_url 参数注入任意 Web 脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WHMCS Bridge WHMCS Bridge 6.1 ~ 6.1 -

II. Public POCs for CVE-2021-4074

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III. Intelligence Information for CVE-2021-4074

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Patches & Fixes for CVE-2021-4074 (1)

Vendor Advisories for CVE-2021-4074 (1)

IV. Related Vulnerabilities

Same product: WHMCS Bridge
Same weakness: CWE-79

V. Comments for CVE-2021-4074

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