Is CVE-2026-5302 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5302 being exploited in the wild.

How severe is CVE-2026-5302?

Medium severity, with a CVSS score of 6.3, published 8 April 2026.

Is there a fix for CVE-2026-5302?

A patch was published on 2026-04-08: Fixed in version 4.0.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-5302 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-5302?

Check whether you run Coolercontrold at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-5302: CoolerControl coolercontrold CORS misconfiguration

CVE-2026-5302 · Severity: medium · CVSS 6.3 · Published 2026-04-08

CoolerControl is a software suite used to monitor and control hardware cooling systems like fans and liquid coolers. A security flaw in the background service allows malicious websites to bypass browser security protections. If a user visits a compromised site while the software is running, an attacker could remotely view system data or change cooling settings, potentially leading to hardware overheating or unauthorized system access.

Technologies: Coolercontrold. Vendors: Coolercontrol.

Quick answers

Is CVE-2026-5302 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5302 being exploited in the wild.
How severe is CVE-2026-5302?: Medium severity, with a CVSS score of 6.3, published 8 April 2026.
Which products and versions are affected?: Coolercontrold < 4.0.0.
Is there a fix for CVE-2026-5302?: A patch was published on 2026-04-08: Fixed in version 4.0.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-5302 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-5302?: Check whether you run Coolercontrold at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A Cross-Origin Resource Sharing (CORS) misconfiguration exists in the coolercontrold API in versions prior to 4.0.0. The service implements a permissive cross-domain policy (CWE-942) that fails to properly restrict which origins can interact with the local API. An attacker can exploit this by enticing a user to visit a malicious website, which then uses the user's browser as a proxy to send unauthorized requests to the local coolercontrold service. This allows for unauthenticated data exfiltration and the execution of commands. The issue is resolved in version 4.0.0.

Affected products

CoolerControl coolercontrold < 4.0.0

Timeline

2026-04-08: disclosed
2026-04-08: advisory
2026-04-08: patched: Fixed in version 4.0.0

References

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