Quick answers
- Is CVE-2026-77549 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-77549 being exploited in the wild.
- How severe is CVE-2026-77549?
- Critical severity, with a CVSS score of 9, published 26 August 2026.
- Which products and versions are affected?
- Ubiquiti UniFi OS.
- Is there a fix for CVE-2026-77549?
- 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-2026-77549 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-77549?
- 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 authentication handling. An attacker with network access can craft malicious input containing CRLF characters to inject unintended control sequences, bypassing authentication mechanisms. No user interaction or prior authentication is required; the attack is triggered by network-level manipulation of input data. Successful exploitation allows an attacker to gain unauthorized administrative access to UniFi OS instances. Patches are available through Ubiquiti's security advisories.
Affected products
- Ubiquiti UniFi OS
Timeline
- 2026-08-26: disclosed