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CVE-2021-43808— Blade `@parent` Exploitation Leading To Possible XSS in Laravel

Quick assessment

Affected
laravel framework
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.

Laravel Framework是Taylor Otwell个人开发者的一款基于PHP的Web应用程序开发框架。 Laravel Framework 8.75.0、7.30.6 和 6.20.42 之前的版本存在跨站脚本漏洞，攻击者可通过 Blade 模板引擎来执行xss攻击。

CVSS 5.3 · Medium EPSS 0.83% · P56
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I. Basic Information for CVE-2021-43808

Vulnerability Information
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Vulnerability Title
Blade `@parent` Exploitation Leading To Possible XSS in Laravel
Source: CVE Program / CVE List V5
Vulnerability Description
Laravel is a web application framework. Laravel prior to versions 8.75.0, 7.30.6, and 6.20.42 contain a possible cross-site scripting (XSS) vulnerability in the Blade templating engine. A broken HTML element may be clicked and the user taken to another location in their browser due to XSS. This is due to the user being able to guess the parent placeholder SHA-1 hash by trying common names of sections. If the parent template contains an exploitable HTML structure an XSS vulnerability can be exposed. This vulnerability has been patched in versions 8.75.0, 7.30.6, and 6.20.42 by determining the parent placeholder at runtime and using a random hash that is unique to each request.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/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
Laravel Framework 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Laravel Framework是Taylor Otwell个人开发者的一款基于PHP的Web应用程序开发框架。 Laravel Framework 8.75.0、7.30.6 和 6.20.42 之前的版本存在跨站脚本漏洞，攻击者可通过 Blade 模板引擎来执行xss攻击。
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
laravel framework >= 8.0.0, < 8.75.0 -

II. Public POCs for CVE-2021-43808

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III. Intelligence Information for CVE-2021-43808

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Patches & Fixes for CVE-2021-43808 (3)

Vendor Advisories for CVE-2021-43808 (1)

Other References for CVE-2021-43808 (3)

IV. Related Vulnerabilities

Same product: framework
Same vendor: laravel
Same weakness: CWE-79

V. Comments for CVE-2021-43808

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