---
id: "CVE-2026-9827"
kind: "vulnerability"
aliases: ["CVE-2026-9827"]
title: "TOTOLINK X2000R router: authenticated file upload lets attackers run code"
severity: "critical"
cvss: 9.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "X2000R", "fixed": [], "affected": "TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327", "ecosystem": "vendor"}]
ecosystems: []
tags: ["infrastructure", "router", "self-hosted", "totolink", "x2000r"]
not_affected_if: ["auth-required", "other-firmware-versions", "remote-admin-disabled"]
published_at: "2026-10-20T21:17:23+00:00"
first_seen_at: "2026-10-23T21:57:21+00:00"
updated_at: "2026-10-23T23:11:22+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9827", "first_seen_at": "2026-10-23T21:57:21+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T23:11:22+00:00"}]
---

# TOTOLINK X2000R router: authenticated file upload lets attackers run code

Authenticated path traversal in the boa web server's /boafrm/formUploadFile on the TOTOLINK X2000R. The uploaded filename is not validated, so '../' lets a logged-in user write any root-writable file, which leads to code execution. Talos reported it 2026-06-16; the vendor acknowledged it but no fixed firmware has been published. CVSS 9.1 (PR:H, so admin login is needed).

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:X2000R affected TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 fixed ?

## How to check

Open the router admin page (Status/firmware info) and read the firmware version. Exposed if it is TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. Also check whether the admin interface (boa, /boafrm/*) is reachable from WAN. Other builds: unknown, not tested by Talos.

## Fix

No fixed firmware published as of 2026-10-23 (unknown). Check totolink.net X2000R product page for a newer build. Meanwhile: disable WAN/remote administration, change the default admin password, restrict the admin UI to a trusted LAN segment.

## Timeline

- 2026-10-23T21:57:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-9827
- 2026-10-23T23:11:22+00:00 analyst — Read Talos TALOS-2026-2430 (primary). Only build TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 confirmed vulnerable; no vendor fix found (vendor acked 2026-06-25, silent since). No public exploit or KEV; no social search done (low-profile CVE). Sibling X2000R CVEs from same Talos batch exist.

## Documents

- [advisory] TALOS-2026-2430: Totolink X2000R boa formUploadFile arbitrary file write https://talosintelligence.com/vulnerability_reports/TALOS-2026-2430
- [mentions] VulDB: Totolink X2000R formUploadFile (CVE-2026-9827) https://vuldb.com/vuln/424078

## From the sources

A arbitrary file write vulnerability exists in the boa formUploadFile functionality of X2000R (version(s): TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327). A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_