# CVE-2026-77553: Ubiquiti UniFi Access privilege escalation

Source: https://junglewise.ai/threats/cve-2026-77553-ubiquiti-unifi-access-privilege-escalation  
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-2026-77553 · Severity: critical · CVSS 9.9 · Published 2026-08-26

UniFi Access is a network access control application used to manage device permissions and security in enterprise environments. A privilege escalation vulnerability allows a low-privileged user with network access to escalate their permissions on the host device, potentially enabling unauthorized administrative control or lateral movement within the network.

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

## Quick answers

**Is CVE-2026-77553 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77553 being exploited in the wild.

**How severe is CVE-2026-77553?** 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-2026-77553?** 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-2026-77553 attacked?** It is attacked over the network or with local access, in a network appliance.

**Am I affected by CVE-2026-77553?** 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

An improper access control vulnerability in the UniFi Access application allows privilege escalation on the host device. The vulnerability requires network access and low-level privileges on the system, but does not require authentication bypass. A successful exploitation grants an attacker elevated privileges on the affected host, potentially leading to full administrative control. Patch availability details are not confirmed in the provided advisory excerpt.

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