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CVE-2026-5301 CoolerControl CVE debrief

CVE-2026-5301 is a high-severity vulnerability in CoolerControl's log viewer, allowing unauthenticated attackers to execute malicious JavaScript via poisoned log entries. The vulnerability exists in versions prior to 4.0.0 of the coolercontrol-ui package. This stored XSS (Cross-Site Scripting) issue enables attackers to inject malicious code into log entries, which can then be executed by other users who view the logs. The vulnerability has a CVSS score of 7.6 and is classified as HIGH severity. Users of CoolerControl's coolercontrold product, particularly those using versions prior to 4.0.0, should be aware of this vulnerability and take steps to mitigate it.

Vendor
CoolerControl
Product
coolercontrol-ui
CVSS
HIGH 7.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-08
Original CVE updated
2026-07-24
Advisory published
2026-04-08
Advisory updated
2026-07-24

Who should care

Users of CoolerControl's coolercontrold product, particularly those using versions prior to 4.0.0, should be aware of this vulnerability and take steps to mitigate it. This includes upgrading to version 4.0.0 or later of the coolercontrol-ui package, reviewing and sanitizing log entries for malicious content, and implementing additional security measures to prevent XSS attacks. Operators, platform administrators, and security teams should review their deployments and plan for updates or mitigations.

Technical summary

The vulnerability is a stored XSS (Cross-Site Scripting) issue in the log viewer of CoolerControl's coolercontrold product. It allows unauthenticated attackers to inject malicious JavaScript code into log entries, which can then be executed by other users who view the logs. The vulnerability has a CVSS score of 7.6 and is classified as HIGH severity. The vulnerability is documented in the CVE-2026-5301 record and the NVD entry. Additional information can be found in the CoolerControl GitLab repository.

Defensive priority

High

Recommended defensive actions

  • Upgrade to version 4.0.0 or later of the coolercontrol-ui package
  • Review and sanitize log entries for malicious content
  • Implement additional security measures to prevent XSS attacks
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability is documented in the CVE-2026-5301 record and the NVD entry. Additional information can be found in the CoolerControl GitLab repository. The CoolerControl team has provided a patch for this vulnerability in version 4.0.0 of the coolercontrol-ui package. Users should verify their deployments and plan for updates or mitigations. The CVE record was published on 2026-04-08T13:16:43.260Z and has not been modified since then. The NVD entry provides a CVSS score of 7.6 and classifies the vulnerability as HIGH severity.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-04-08T13:16:43.260Z and has not been modified since then.