CVE-2025-29756 MQTT implementation in Sungrow iSolarCloud allowed users to subscribe to all data of all connected inverters
Authenticated users can subscribe to all MQTT topics to read encrypted data from all connected solar inverters due to insufficient topic restrictions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-29756?
CVE-2025-29756 is a high-severity missing authorization vulnerability in SunGrow iSolarCloud, published on 11 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
SunGrow's back end users system iSolarCloud https://isolarcloud.com uses an MQTT service to transport data from the user's connected devices to the user's web browser. The MQTT server however did not have sufficient restrictions in place to limit the topics that a user could subscribe to. While the data that is transmitted through the MQTT server is encrypted and the credentials for the MQTT server are obtained though an API call, the credentials could be used to subscribe to any topic and the encryption key can be used to decrypt all messages received. An attack with an account on iSolarCloud.com could extract MQTT credentials and the decryption key from the browser and then use an external program to subscribe to the topic '#' and thus recieve all messages from all connected devices.
Weakness: CWE-862
Which versions are affected by CVE-2025-29756?
How do I fix CVE-2025-29756?
No fix has been published for CVE-2025-29756 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-29756 being exploited?
There is no known exploitation of CVE-2025-29756 in the wild and no public exploit code.
Sources
Also known as GHSA-59wx-gr78-xr29.