# CVE-2026-77543: Ubiquiti UniFi Access command injection via improper input validation

Source: https://junglewise.ai/threats/cve-2026-77543-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-2026-77543 · Severity: critical · CVSS 9.9 · Published 2026-08-26

UniFi Access is a network access control system used to manage authentication and authorization to corporate networks. An attacker with network access and low privileges can inject arbitrary commands through the application, leading to complete compromise of the access control device and potentially lateral movement into the broader network.

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

## Quick answers

**Is CVE-2026-77543 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77543 being exploited in the wild.

**How severe is CVE-2026-77543?** 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-2026-77543?** 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-2026-77543 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-77543?** 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 vulnerability (CWE-20) that allows command injection attacks. An authenticated attacker with low privileges and network access to the device can craft malicious input that bypasses validation filters, leading to arbitrary command execution on the host system. This vulnerability requires network access and some level of authentication or low-privilege account access. Successful exploitation grants an attacker the ability to execute arbitrary commands with the privileges of the UniFi Access application, potentially leading to full device compromise. Ubiquiti has published security advisory bulletin 067 addressing this vulnerability.

## 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-2026-77546-ubiquiti-unifi-access-command-injection-via-improper-input)