Summary
Home Assistant has stored XSS in history-graphs
Impact
The impact of this vulnerability is that a user can target other users of the system and perform account takeover through client side exploitation of XSS.
In the context of this system, I believe the vulnerability to be less impactful than the CVSS metric describes. It is not displayed anywhere by default, it is not natural to display this history graph, and it also has no potential for being imported through seemingly innocent integrations. It also appears to rely on having used/using Android Auto. Other devices which has the same sensor can trigger the same vulnerability, and I expect there to exists cloud-based devices that would enable a threat actor to deliver the payload remotely.
Credit: Robin Lunde - https://robinlunde.com
Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.
Affected versions
Security releases
Kodem intelligence
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. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2026-33045? CVE-2026-33045 is a low-severity cross-site scripting (XSS) vulnerability in homeassistant (pip), affecting versions >= 2025.02, < 2026.01. It is fixed in 2026.01. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
- Which versions of homeassistant are affected by CVE-2026-33045? homeassistant (pip) versions >= 2025.02, < 2026.01 is affected.
- Is there a fix for CVE-2026-33045? Yes. CVE-2026-33045 is fixed in 2026.01. Upgrade to this version or later.
- Is CVE-2026-33045 exploitable, and should I be worried? Whether CVE-2026-33045 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
- What actually determines whether CVE-2026-33045 is exploitable, and how bad it is? 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.
- How do I fix CVE-2026-33045? Upgrade
homeassistantto 2026.01 or later.