# CVE-2026-77546: Ubiquiti UniFi Access command injection via improper input validation

Source: https://junglewise.ai/threats/cve-2026-77546-ubiquiti-unifi-access-command-injection-via-improper-input  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-26. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-77546 · Severity: critical · CVSS 9.9 · Published 2026-08-26

UniFi Access is Ubiquiti's access control and management application used to secure physical and network access to enterprise facilities. A network-accessible command injection vulnerability allows attackers with low privileges to execute arbitrary system commands on the access control hardware, potentially compromising the entire access control infrastructure and enabling unauthorized physical access.

Technologies: [Ubiquiti UniFi Access](https://junglewise.ai/threats/technologies/unifi-access). Vendors: [Ubiquiti](https://junglewise.ai/threats/vendors/ubiquiti).

## Quick answers

**Is CVE-2026-77546 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77546 being exploited in the wild.

**How severe is CVE-2026-77546?** Critical severity, with a CVSS score of 9.9, published 26 August 2026.

**Which products and versions are affected?** Ubiquiti UniFi Access.

**Is there a fix for CVE-2026-77546?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-77546 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-77546?** Check whether you run Ubiquiti UniFi Access. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

UniFi Access contains an improper input validation flaw that enables command injection attacks. An attacker with network access and low-level privileges can craft malicious input that bypasses validation checks and execute arbitrary commands with system-level privileges on the host device. The vulnerability requires network access but no authentication escalation, making it exploitable by low-privilege users already on the network. Successful exploitation allows complete compromise of the access control system, including credential theft, access policy modification, and facility access bypasses.

## Affected products

- Ubiquiti UniFi Access

## Timeline

- 2026-08-26: disclosed

## References

- [https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9](https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9)

## Related threats

- [Ubiquiti UniFi Access privilege escalation](https://junglewise.ai/threats/cve-2026-77553-ubiquiti-unifi-access-privilege-escalation)
- [Ubiquiti UniFi Access command injection in input validation](https://junglewise.ai/threats/cve-2026-77547-ubiquiti-unifi-access-command-injection-in-input-validation)
- [Ubiquiti UniFi Access command injection via improper input validation](https://junglewise.ai/threats/cve-2026-77543-ubiquiti-unifi-access-command-injection-via-improper-input)