CVE-2026-5300: Missing Authentication for Critical Function in coolercontrold

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-08 · updated 2026-10-23
Weakness: CWE-306

Description

Unauthenticated functionality in CoolerControl/coolercontrold <4.0.0 allows unauthenticated attackers to view and modify potentially sensitive data via HTTP requests

Affected products

coolercontrold: before 4.0.0 — fixed in 4.0.0

How to fix

Upgrade to a fixed version: coolercontrold 4.0.0. Check the vendor advisory for mitigations.

References

https://gitlab.com/coolercontrol/coolercontrol/-/blob/3.1.1/coolercontrold/src/api/router.rs?ref_type=tags
https://gitlab.com/coolercontrol/coolercontrol/-/releases/4.0.0

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