CVE-2026-55117: A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi Acces

Q: How do I fix CVE-2026-55117?

unifi access: upgrade to 4.2.29. Exact commands for each OS are on this page.

Q: Is CVE-2026-55117 being exploited?

CVE-2026-55117 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-2026-55117 affect?

CVE-2026-55117 affects unifi access. Severity is high (CVSS 8.6). A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi Access Application to access files on the host device.

Q: How urgent is CVE-2026-55117?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.6REMOTEUPGRADE

CVE-2026-55117 is a high-severity flaw (CVSS 8.6) affecting unifi access. 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 could exploit a Path Traversal vulnerability found in UniFi Access Application to access files on the host device.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-07-02
Last modified	2026-10-25

Publisher (CNA): HackerOne · Vendor: ui

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-02 15:17 UTCPublished CVE record published
2026-10-25 21:10 UTCUpdated Record last modified

ui unifi access UPGRADE

Affected: < 4.2.29

Fixed in: 4.2.29

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy unifi-access || rpm -q unifi-access || unifi-access --version

2. UPGRADE to 4.2.29 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade unifi-access

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade unifi-access

Note

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

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-2026-55117?

unifi access: upgrade to 4.2.29. Exact commands for each OS are on this page.

Is CVE-2026-55117 being exploited?

CVE-2026-55117 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-2026-55117 affect?

CVE-2026-55117 affects unifi access. Severity is high (CVSS 8.6). A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi Access Application to access files on the host device.

How urgent is CVE-2026-55117?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

Software pages

Ubiquiti vulnerabilities

Related CVEs

CVE-2026-50748 CRITICAL 9.9 UPGRADE A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vul
CVE-2026-54400 CRITICAL 9.1 UPGRADE A malicious actor with access to the network and high privileges could exploit an Improper Access Control vuln

References

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