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CVE-2026-77550 is a critical improper neutralization of CRLF sequences vulnerability in certain Ubiquiti UniFi OS devices and instances. A network-reachable unauthenticated attacker can use CRLF injection to bypass UniFi OS authentication controls. The issue affects UniFi OS Server and supported UniFi OS device families before their applicable fixed releases, including UniFi OS Server 5.1.37, device firmware 5.1.31, NAS firmware 5.1.32, and UniFi Express 4.0.17.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical, remotely exploitable UniFi OS Server vulnerability requiring no privileges or user interaction, with low attack complexity and high confidentiality, integrity, and availability impact. The CVSS v3 vector indicates scope change.
Critical authentication-bypass vulnerability in Ubiquiti UniFi OS devices and instances.
An authentication-bypass vulnerability caused by improper neutralization of CRLF sequences in certain devices running UniFi OS. A network-accessible attacker could bypass authentication on affected UniFi OS devices or instances.
A maximum-severity CRLF-injection vulnerability affecting UniFi OS devices, remotely exploitable without privileges or user interaction and potentially enabling device compromise or authentication bypass.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.