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CVE-2026-34908 is a critical improper access control vulnerability in Ubiquiti UniFi OS. The flaw allows a malicious actor with network access to make unauthorized changes to affected UniFi OS devices without administrator authentication. Public reporting consistently characterizes the issue as affecting the UniFi OS management plane and enabling unauthorized modification of system settings. The vendor description does not publicly disclose the exact vulnerable function, endpoint, or code path, but available reporting indicates the weakness can be used as the access-control bypass component of a broader exploit chain with CVE-2026-34909 and CVE-2026-34910.
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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 critical HTTP vulnerability identified as CVE-2026-34908. The snippet suggests a path traversal or proxy path manipulation issue involving encoded traversal sequences and /proxy/<service>/ and /api/auth/validate-sso/ endpoints, but the exact product and impact are not explicitly stated.
A specific vulnerability listed among the report's analyzed CVEs, but without further detail in the content.
Ubiquiti UniFi OSのアクセス制御回避の脆弱性。本文では、この脆弱性を狙った攻撃が観測されており、深刻度はCVSS 10.0とされている。
A Ubiquiti UniFi OS improper access control vulnerability referenced as having been added to CISA's KEV catalog.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.