CVE-2026-77550: CWE-93 Improper neutralization of CRLF sequences ('CRLF injection') in Ubiquiti Inc UniFi OS Server
Description
CVE-2026-77550 is a critical vulnerability in Ubiquiti Inc's UniFi OS Server involving improper neutralization of CRLF sequences (CRLF injection). This flaw allows a malicious actor with network access to potentially bypass authentication on affected UniFi OS devices or instances. The vulnerability has a maximum CVSS score of 10, indicating severe impact on confidentiality, integrity, and availability. No specific affected versions or patches have been provided yet, and no known exploits are reported in the wild.
CVSS v3.1
Score 10.0critical
Affected software
Ubiquiti Inc
UniFi OS Server
Ubiquiti Inc
Cloud Keys
Ubiquiti Inc
Network Video Recorders
Ubiquiti Inc
Enterprise Network Video Recorders
Ubiquiti Inc
Enterprise Network Attached Storage
Ubiquiti Inc
Dream Machines
Ubiquiti Inc
Enterprise Firewall Core
Ubiquiti Inc
Dream Routers
Ubiquiti Inc
Enterprise Fortress Gateway
Ubiquiti Inc
Cloud Gateways
Ubiquiti Inc
Dream Wall
Ubiquiti Inc
Express 7
Ubiquiti Inc
Network Attached Storage
Ubiquiti Inc
Express
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-93) in UniFi OS Server arises from improper neutralization of CRLF sequences, enabling an attacker on the network to bypass authentication mechanisms. The issue affects certain UniFi OS devices, though exact versions impacted are not specified. The CVSS 3.1 score of 10.0 reflects that the vulnerability is remotely exploitable without privileges or user interaction and results in complete compromise of confidentiality, integrity, and availability. No vendor remediation or patch information is currently available.
Potential Impact
Successful exploitation could allow an unauthenticated attacker on the network to bypass authentication controls on UniFi OS devices, potentially leading to full system compromise including unauthorized access and control. The vulnerability impacts confidentiality, integrity, and availability at a critical level.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict network access to UniFi OS devices to trusted users and networks only to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Ubiquiti
- Date Reserved
- 2026-08-20T20:32:37.794Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8ec57dacd9273b49c21783
Added to database: 08/26/2026, 10:52:45 UTC
Last enriched: 09/09/2026, 18:37:14 UTC
Last updated: 10/10/2026, 18:48:22 UTC
Views: 115
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