| Package | Affected versions | Patched versions |
|---|---|---|
| homeassistant | ≥ 2020.02, < 2026.01 | 2026.01 |
| home-assistant | ≥ 2020.02, < 2026.1.0 | 2026.1.0 |
An authenticated party can add a malicious name to their device entity, allowing for Cross-Site Scripting attacks against anyone who can see a dashboard with a Map-card which includes that entity. It requires that the victim hovers over an information point (The lines or the dots representing that device's movement, as shown in the screenshot below, with the example showing a html-injection using <s> to strikethrough the text)
<img width="348" height="355" alt="image" src="https://github.com/user-attachments/assets/1af3ef33-3a72-4816-8ade-e6405aace176" />
This allows an authenticated user to execute JavaScript in the context of any other users accessing a dashboard.
The vulnerability exists in the map-card by adding a malicious entity and having the property hours_to_show set.
See example below, with the malicious entity being Pixel 9 <s> Fold Robin {{7*7}}:
Map card with malicious device entity:
<img width="338" height="332" alt="image" src="https://github.com/user-attachments/assets/15229cc3-1b69-438c-9ee5-cbfa9483aec9" />
YAML-view of same card: <img width="338" height="198" alt="image" src="https://github.com/user-attachments/assets/cd579266-75c3-4cdf-9d08-1544a6887feb" />
This issue largely resembles the issue documented in: CVE-2025-62172, but with an entity which can be displayed in a Map, instead of in an energy-dashboard.
test <img src=x onerror=alert(document.domain) />
For a new entity, it should work when setting the name. For old entities, go here:
<img width="1300" height="411" alt="image" src="https://github.com/user-attachments/assets/d240549e-f26c-4617-89d7-5480451ae5a3" />
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site free(The left arrow showing the custom setting, and the right arrow showing a data point which needs to be hovered)
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, as it requires a specific setup (map-card with attribute hours_to_show set, as this brings up the trail). It is interesting to note that any user who sets this attribute, will be highly likely to trigger the vulnerability through normal use. It also has no potential for being imported through seemingly innocent integrations and can only be set explicitly by another invited user, a device name, a cloud service or through social engineering. 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.
Suggested criticality: Medium
Credit: Robin Lunde - https://robinlunde.com