CVE-2026-5300Network attack vector

Unauthenticated data read and modification via API

Published Apr 8, 2026 · Updated Apr 8, 2026

Missing authentication in CoolerControl coolercontrold 0.14.0 through 3.1.1 allows remote attackers to read and modify data via HTTP. The 3.1.1 API router exposes device, status, profile, mode, settings, plugin, alert, log, and event routes without authentication middleware, including a UI-settings write handler. Access is unauthenticated, but network reachability depends on deployment because the daemon binds to loopback by default; exposed instances disclose hardware and configuration data and accept state changes.

CVSS severity5.9
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in CoolerControl coolercontrold 0.14.0 through 3.1.1 allows remote attackers to read and modify data via HTTP. The 3.1.1 API router exposes device, status, profile, mode, settings, plugin, alert, log, and event routes without authentication middleware, including a UI-settings write handler. Access is unauthenticated, but network reachability depends on deployment because the daemon binds to loopback by default; exposed instances disclose hardware and configuration data and accept state changes.

The record

CVE
CVE-2026-5300
Published
Apr 8, 2026
Updated
Apr 8, 2026
Vendor
CoolerControl
Product
coolercontrold
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.14.0 <4.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CoolerControl · coolercontroldversion=0.14.0 <4.0.0

Published CVSS scores

5.9GitLab Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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