CVE-2026-34911: A malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability f
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HIGH 7.7UPGRADEUPGRADEUPGRADE
CVE-2026-34911 is a high-severity flaw (CVSS 7.7) affecting unifi os server, unifi cloud gateway industrial firmware, unifi dream machine firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to obtain sensitive information.
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
ui unifi dream machine firmware UPGRADE
Affected: < 5.1.12
Fixed in: 5.1.12
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
ui unifi dream machine pro firmware UPGRADE
Affected: < 5.1.12
Fixed in: 5.1.12
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
ui unifi dream machine special edition firmware UPGRADE
Affected: < 5.1.12
Fixed in: 5.1.12
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
ui unifi dream machine pro max firmware UPGRADE
Affected: < 5.1.12
Fixed in: 5.1.12
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official sourceNVD · 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-2026-34911?
unifi os server: upgrade to 5.0.8; unifi cloud gateway industrial firmware: upgrade to 5.1.12; unifi dream machine firmware: upgrade to 5.1.12. Exact commands for each OS are on this page.
Is CVE-2026-34911 being exploited?
CVE-2026-34911 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-2026-34911 affect?
CVE-2026-34911 affects unifi os server, unifi cloud gateway industrial firmware, unifi dream machine firmware. Severity is high (CVSS 7.7). A malicious actor with access to the network and low privileges could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to obtain sensitive information.
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