CVE-2026-50748: A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vul

Q: How do I fix CVE-2026-50748?

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

Q: Is CVE-2026-50748 being exploited?

CVE-2026-50748 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-2026-50748 affect?

CVE-2026-50748 affects unifi access. Severity is critical (CVSS 9.9). A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi Access Application to execute a Command Injection on the host device.

Q: How urgent is CVE-2026-50748?

Priority 54/100. Critical severity

This month

CRITICAL 9.9UPGRADE

CVE-2026-50748 is a critical-severity flaw (CVSS 9.9) 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 and low privileges could exploit an Improper Input Validation vulnerability found in UniFi Access Application to execute a Command Injection on the host device.

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-20
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.

Exact fixes by distribution

Fedora 46 · mingw-qt5-qtwebkit · FIXED · 5.212.0-0.46.alpha4.fc46 · FEDORA-2026-46ae541c22 · source

sudo dnf upgrade --advisory=FEDORA-2026-46ae541c22

Fedora ELN · kdominate · FIXED · 26.08.2-2.eln159 · FEDORA-2026-b1d98239fd · source

sudo dnf upgrade --advisory=FEDORA-2026-b1d98239fd

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-2026-50748?

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

Is CVE-2026-50748 being exploited?

CVE-2026-50748 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-2026-50748 affect?

CVE-2026-50748 affects unifi access. Severity is critical (CVSS 9.9). A malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi Access Application to execute a Command Injection on the host device.

How urgent is CVE-2026-50748?

Priority 54/100. Critical severity

Software pages

Ubiquiti vulnerabilities

Related CVEs

CVE-2026-55117 HIGH 8.6 UPGRADE A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi Acces
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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