CVE-2026-5302Network attack vector

Unauthenticated data access and commands via permissive CORS

Published Apr 8, 2026 · Updated Apr 8, 2026

CORS misconfiguration in CoolerControl coolercontrold before 4.0.0 allows remote attackers to read data and send commands via malicious sites. The REST API's CORS layer mirrors every request origin, header, and method while allowing credentials, granting untrusted websites cross-origin access. Exploitation requires a user to visit an attacker-controlled site while the browser can reach the daemon; the attacker gains access to cooling data and control commands.

CVSS severity8.1
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CORS misconfiguration in CoolerControl coolercontrold before 4.0.0 allows remote attackers to read data and send commands via malicious sites. The REST API's CORS layer mirrors every request origin, header, and method while allowing credentials, granting untrusted websites cross-origin access. Exploitation requires a user to visit an attacker-controlled site while the browser can reach the daemon; the attacker gains access to cooling data and control commands.

The record

CVE
CVE-2026-5302
Published
Apr 8, 2026
Updated
Apr 8, 2026
Vendor
CoolerControl
Product
coolercontrold
Classifications
CWE-942, T1189
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=2.0.0 <4.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CoolerControl · coolercontroldversion=2.0.0 <4.0.0

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
6.3GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-942Permissive Cross-domain Policy with Untrusted Domains
T1189Drive-by Compromise

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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