CVE-2023-41895

Cross-site Scripting via auth_callback login in Home Assistant Core

Description

Home assistant is an open source home automation. The Home Assistant login page allows users to use their local Home Assistant credentials and log in to another website that specifies the `redirect_uri` and `client_id` parameters. Although the `redirect_uri` validation typically ensures that it matches the `client_id` and the scheme represents either `http` or `https`, Home Assistant will fetch the `client_id` and check for `<link rel="redirect_uri" href="...">` HTML tags on the page. These URLs are not subjected to the same scheme validation and thus allow for arbitrary JavaScript execution on the Home Assistant administration page via usage of `javascript:` scheme URIs. This Cross-site Scripting (XSS) vulnerability can be executed on the Home Assistant frontend domain, which may be used for a full takeover of the Home Assistant account and installation. This issue has been addressed in version 2023.9.0 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

Category

8.8
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.66% Top 30%
Vendor Advisory github.com
Affected: home-assistant core
Published at:
Updated at:

References

Link Tags
https://github.com/home-assistant/core/security/advisories/GHSA-jvxq-x42r-f7mv vendor advisory

Frequently Asked Questions

What is the severity of CVE-2023-41895?
CVE-2023-41895 has been scored as a high severity vulnerability.
How to fix CVE-2023-41895?
To fix CVE-2023-41895, 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-2023-41895 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-41895 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-41895?
CVE-2023-41895 affects home-assistant core.
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