CVE-2026-5301: Stored XSS in log viewer in CoolerControl/coolercontrol-ui <4.0.0 allows unauthenticated attackers to take ove

Q: How do I fix CVE-2026-5301?

coolercontrold: upgrade to 4.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-5301 being exploited?

CVE-2026-5301 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-5301 affect?

CVE-2026-5301 affects coolercontrold. Severity is high (CVSS 7.6). Stored XSS in log viewer in CoolerControl/coolercontrol-ui <4.0.0 allows unauthenticated attackers to take over the service via malicious JavaScript in poisoned log entries

Routine

HIGH 7.6UPGRADE

CVE-2026-5301 is a high-severity flaw (CVSS 7.6) affecting coolercontrold. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stored XSS in log viewer in CoolerControl/coolercontrol-ui <4.0.0 allows unauthenticated attackers to take over the service via malicious JavaScript in poisoned log entries

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-08
Last modified	2026-10-23

Publisher (CNA): GitLab Inc. · Vendor: coolercontrol

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 13:16 UTCPublished CVE record published
2026-10-23 22:10 UTCUpdated Record last modified

coolercontrol coolercontrold UPGRADE

Affected: < 4.0.0

Fixed in: 4.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy coolercontrold || rpm -q coolercontrold || coolercontrold --version

2. UPGRADE to 4.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade coolercontrold

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade coolercontrold

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · sugar-calculator · FIXED · 47-14.fc46 · FEDORA-2026-38eeb9e279 · source

sudo dnf upgrade --advisory=FEDORA-2026-38eeb9e279

Fedora ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-5301?

coolercontrold: upgrade to 4.0.0. Exact commands for each OS are on this page.

Is CVE-2026-5301 being exploited?

CVE-2026-5301 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-5301 affect?

CVE-2026-5301 affects coolercontrold. Severity is high (CVSS 7.6). Stored XSS in log viewer in CoolerControl/coolercontrol-ui <4.0.0 allows unauthenticated attackers to take over the service via malicious JavaScript in poisoned log entries

How urgent is CVE-2026-5301?

Priority 34/100. High severity

Related CVEs

CVE-2026-5208 HIGH 8.2 UPGRADE Command injection in alerts in CoolerControl/coolercontrold <4.0.0 allows authenticated attackers to execute a
CVE-2026-5302 MEDIUM 6.3 UPGRADE CORS misconfiguration in CoolerControl/coolercontrold <4.0.0 allows unauthenticated remote attackers to read d
CVE-2026-5300 MEDIUM 5.9 UPGRADE Unauthenticated functionality in CoolerControl/coolercontrold <4.0.0 allows unauthenticated attackers to view

References

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