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CVE-2026-34908 is an improper access control vulnerability in Ubiquiti UniFi OS. An attacker with network access to a vulnerable UniFi OS management interface can make unauthorized changes to the system. The issue affects multiple UniFi OS deployments and appliances, including UniFi OS Server 5.0.6 and earlier and specified Cloud Gateway, Dream Machine, NVR, Cloud Key, and NAS releases prior to their applicable fixed versions. The vulnerability has also been reported as a component of a chain with CVE-2026-34909 and CVE-2026-34910 that can yield unauthenticated root-level remote code execution.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
Repository contains two security artifacts and supporting documentation: a Python exploit script (CVE-2026-34910.py) and a Nuclei template (CVE-2026-34908-unifi-auth-bypass.yaml), plus README and license. Because this repository includes a framework artifact, the main exploit logic is split between a Nuclei detection template for CVE-2026-34908 and a standalone Python PoC for CVE-2026-34910/CVE-2026-34909. The Python script is the primary offensive component. It disables TLS verification, accepts a target URL, and exposes three modes: `--check` to verify the auth bypass by requesting the internal `latest_package` handler through `/api/auth/validate-sso/..%2f..%2f..%2f`, direct command execution by injecting `evil;<command>` into the `pkg_name` query parameter with `by_cmd=true`, and `--read <path>` to retrieve arbitrary files through a traversal path under `/app-assets/users/`. The script treats HTTP 200 responses from the internal handler as success and includes a proof helper that attempts to create `/tmp/PWNED_34910` on the target. The Nuclei YAML is a detection-only template for CVE-2026-34908. It sends a single crafted GET request to `/api/auth/validate-sso/..%2f..%2f..%2fproxy/users/api/v2/ucs/update/latest_package` and matches on HTTP 200 plus response markers such as `pkg_name` and `required`, confirming unauthorized reachability of the internal handler without executing a payload. Overall purpose: demonstrate and operationalize a chain of UniFi OS vulnerabilities affecting pre-SAB-064 systems: CVE-2026-34908 auth bypass, CVE-2026-34909 arbitrary file read, and CVE-2026-34910 unauthenticated command injection RCE. The repository is not just a detector; it contains working exploit code capable of unauthenticated remote command execution and file disclosure against vulnerable UniFi OS Server targets.
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A Ubiquiti UniFi OS vulnerability that the actor attempted to chain with two other flaws for root-level remote code execution; CISA identified it as actively exploited.
Vulnerability in Ubiquiti UniFi OS targeted as part of the actor's multi-vector exploitation campaign.
One of three chained vulnerabilities used in attempted remote-code-execution attacks against unpatched Ubiquiti UniFi OS devices.
Critical CVSS 10.0 improper access-control flaw in UniFi OS. A raw-versus-normalized URI parsing inconsistency can allow an unauthenticated network attacker to bypass the nginx authentication gateway and reach protected internal endpoints.
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Cross-references every affected SKU, including bundled OEM variants.
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