# CVE-2026-77536: Ubiquiti UniFi OS privilege escalation in access control

Source: https://junglewise.ai/threats/cve-2026-77536-ubiquiti-unifi-os-privilege-escalation-in-access-control  
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-2026-77536 · Severity: critical · CVSS 9.9 · Published 2026-08-26

UniFi OS is a network management platform used to centrally control and monitor Ubiquiti network devices. A network-adjacent attacker with low-level system access could bypass access controls to escalate their privileges, potentially gaining full administrative control over affected UniFi infrastructure and the networks it manages.

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

## Quick answers

**Is CVE-2026-77536 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77536 being exploited in the wild.

**How severe is CVE-2026-77536?** Critical severity, with a CVSS score of 9.9, published 26 August 2026.

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

**Is there a fix for CVE-2026-77536?** 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-2026-77536 attacked?** It is attacked over the network or from the adjacent network.

**Am I affected by CVE-2026-77536?** Check whether you run Ubiquiti UniFi OS. 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

This is an improper access control vulnerability affecting UniFi OS that allows privilege escalation. The vulnerability requires network access and pre-existing low privileges on the affected device, but does not require authentication bypass. An attacker with these preconditions can exploit the access control weakness to elevate to higher privilege levels, potentially achieving administrative access. The vulnerability has been assigned CVE-2026-77536 with a CVSS score of 9.9 (critical). Patch availability should be confirmed through Ubiquiti's security advisory.

## Affected products

- Ubiquiti UniFi OS

## 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 OS CRLF injection authentication bypass](https://junglewise.ai/threats/cve-2026-77550-ubiquiti-unifi-os-crlf-injection-authentication-bypass)
- [Ubiquiti UniFi OS CRLF injection authentication bypass](https://junglewise.ai/threats/cve-2026-77549-ubiquiti-unifi-os-crlf-injection-authentication-bypass)
- [Ubiquiti UniFi OS active debug code privilege escalation](https://junglewise.ai/threats/cve-2026-77545-ubiquiti-unifi-os-active-debug-code-privilege-escalation)
- [Ubiquiti UniFi OS command injection vulnerability](https://junglewise.ai/threats/cve-2026-77540-ubiquiti-unifi-os-command-injection-vulnerability)
- [Ubiquiti UniFi OS command injection in input validation](https://junglewise.ai/threats/cve-2026-77539-ubiquiti-unifi-os-command-injection-in-input-validation)