# CVE-2026-5302: CoolerControl coolercontrold CORS misconfiguration

Source: https://junglewise.ai/threats/cve-2026-5302-coolercontrol-coolercontrold-cors-misconfiguration  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-08. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

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](https://junglewise.ai/threats/technologies/coolercontrold). Vendors: [Coolercontrol](https://junglewise.ai/threats/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

- [https://gitlab.com/coolercontrol/coolercontrol/-/blob/2.0.0/coolercontrold/src/api/mod.rs?ref_type=tags](https://gitlab.com/coolercontrol/coolercontrol/-/blob/2.0.0/coolercontrold/src/api/mod.rs?ref_type=tags)
- [https://gitlab.com/coolercontrol/coolercontrol/-/releases/4.0.0](https://gitlab.com/coolercontrol/coolercontrol/-/releases/4.0.0)

## Related threats

- [CoolerControl coolercontrol-ui stored XSS in log viewer](https://junglewise.ai/threats/cve-2026-5301-coolercontrol-coolercontrol-ui-stored-xss-in-log-viewer)
- [CoolerControl coolercontrold missing authentication in API router](https://junglewise.ai/threats/cve-2026-5300-coolercontrol-coolercontrold-missing-authentication-in-api-router)
- [CoolerControl coolercontrold command injection in alerts](https://junglewise.ai/threats/cve-2026-5208-coolercontrol-coolercontrold-command-injection-in-alerts)