Quick answers
- Is CVE-2026-77550 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-77550 being exploited in the wild.
- How severe is CVE-2026-77550?
- Critical severity, with a CVSS score of 10, published 26 August 2026.
- Which products and versions are affected?
- Ubiquiti UniFi OS.
- Is there a fix for CVE-2026-77550?
- 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-2026-77550 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-77550?
- 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 Neutralization of CRLF Sequences (CWE-93) in UniFi OS that fails to properly sanitize input, allowing an attacker to inject carriage return and line feed characters to manipulate protocol-level behavior. An attacker with network access can craft malicious requests to bypass authentication controls without requiring valid credentials. This is a network-based attack vector that could lead to complete compromise of UniFi OS instances and downstream network infrastructure. A patch is expected from Ubiquiti; users should monitor the security advisory bulletin for available remediation.
Affected products
- Ubiquiti UniFi OS
Timeline
- 2026-08-26: disclosed