CVE-2021-43808

Public Exploit
Blade `@parent` Exploitation Leading To Possible XSS in Laravel

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.

Categories

5.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.34%
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Affected: laravel framework
Published at:
Updated at:

References

Frequently Asked Questions

What is the severity of CVE-2021-43808?
CVE-2021-43808 has been scored as a medium severity vulnerability.
How to fix CVE-2021-43808?
To fix CVE-2021-43808, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-43808 being actively exploited in the wild?
It is possible that CVE-2021-43808 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-43808?
CVE-2021-43808 affects laravel framework.
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