CVE-2023-41893 is a medium-severity security vulnerability in homeassistant (pip), affecting versions >= 0, < 2023.9.0. It is fixed in 2023.9.0.
Part of the Cure53 security audit of Home Assistant. The audit team’s analyses confirmed that the redirecturi and clientid are alterable when logging in. Consequently, the code parameter utilized to fetch the accesstoken post-authentication will be sent to the URL specified in the aforementioned parameters. Since an arbitrary URL is permitted and homeassistant.local represents the preferred, default domain likely used and trusted by many users, an attacker could leverage this weakness to manipulate a user and retrieve account access. Notably, this attack strategy is plausible if the victim has exposed their Home Assistant to the Internet, since after acquiring the victim’s accesstoken, the adversary would need to utilize it directly towards the instance to achieve any pertinent malicious actions. To achieve this compromise attempt, the attacker must send a link with a redirecturi that they control to the victim’s own Home Assistant instance. In the eventuality the victim authenticates via the said link, the attacker would obtain code sent to the specified URL in redirecturi, which can then be leveraged to fetch an access_token. An attacker could increase the efficacy of this strategy by registering a nearly identical domain to homeassistant.local, which at first glance may appear legitimate and thereby obfuscate any malicious intentions. Nonetheless, owing to the requirements for victim interaction and Home Assistant instance exposure to the Internet, this severity rating was consequently downgraded to Low.
CVE-2023-41893 has a CVSS score of 4.3 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (2023.9.0). Upgrading removes the vulnerable code path.
pip
homeassistant (>= 0, < 2023.9.0)homeassistant → 2023.9.0 (pip)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2023-41893 is reachable in your applications. Explore open-source security for your team.
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Upgrade homeassistant to 2023.9.0 or later to resolve this vulnerability.
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2023-41893 is a medium-severity security vulnerability in homeassistant (pip), affecting versions >= 0, < 2023.9.0. It is fixed in 2023.9.0.
CVE-2023-41893 has a CVSS score of 4.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
homeassistant (pip) versions >= 0, < 2023.9.0 is affected.
Yes. CVE-2023-41893 is fixed in 2023.9.0. Upgrade to this version or later.
Whether CVE-2023-41893 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Upgrade homeassistant to 2023.9.0 or later.