Quick answers
- Is CVE-2026-77534 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-77534 being exploited in the wild.
- How severe is CVE-2026-77534?
- 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-2026-77534?
- 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-2026-77534 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-77534?
- 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
The vulnerability is an improper access control flaw in UniFi OS that allows a low-privileged, network-authenticated attacker to escalate privileges on the affected device or instances. The attack requires network access and valid low-level credentials but does not require additional user interaction. Successful exploitation grants an attacker elevated privileges, enabling complete compromise of the UniFi OS device. Patches are available from Ubiquiti via their security advisory.
Affected products
- Ubiquiti UniFi OS
Timeline
- 2026-08-26: disclosed