CVE-2021-43808 Information

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Reference

https://github.com/laravel/framework/releases/tag/v6.20.42 https://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9b https://github.com/laravel/framework/pull/39909 https://github.com/laravel/framework/pull/39908 https://github.com/laravel/framework/security/advisories/GHSA-66hf-2p6w-jqfw https://github.com/laravel/framework/pull/39906 https://github.com/laravel/framework/releases/tag/v7.30.6 https://github.com/laravel/framework/releases/tag/v8.75.0

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.1