# CVE-2026-9827: Totolink X2000R arbitrary file write in boa formUploadFile

Source: https://junglewise.ai/threats/cve-2026-9827-a-arbitrary-file-write-vulnerability-exists-in-the-boa  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-9827 · Severity: critical · CVSS 9.1 · Published 2026-10-20

The Totolink X2000R is a home router that uses a web administration interface for configuration. An authenticated attacker can exploit a path traversal vulnerability in the file upload functionality to write arbitrary files to the router, potentially leading to code execution and complete compromise of the device.

Technologies: [TOTOLINK X2000r](https://junglewise.ai/threats/technologies/x2000r). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-9827 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9827 being exploited in the wild.

**How severe is CVE-2026-9827?** Critical severity, with a CVSS score of 9.1, published 20 October 2026.

**Which products and versions are affected?** TOTOLINK X2000r TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327.

**Is there a fix for CVE-2026-9827?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-9827 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-9827?** Check whether you run TOTOLINK X2000r at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A path traversal vulnerability exists in the formUploadFile() function of the boa web server component, where user-supplied filename input from multipart form data is not properly validated before being passed to file write operations. An authenticated HTTP request to /boafrm/formUploadFile can bypass directory restrictions (CWE-22) and write files to arbitrary locations, enabling remote code execution through firmware modification or executable placement.

## Affected products

- Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327

## Timeline

- 2026-10-20: disclosed

## References

- [https://talosintelligence.com/vulnerability_reports/TALOS-2026-2430](https://talosintelligence.com/vulnerability_reports/TALOS-2026-2430)

## Related threats

- [TOTOLINK X2000R stack-based buffer overflow in formTR069Config](https://junglewise.ai/threats/cve-2026-9869-a-stack-based-buffer-overflow-vulnerability-exists-in-the-boa)
- [Totolink X2000R stack-based buffer overflow in boa formUploadFile](https://junglewise.ai/threats/cve-2026-9817-a-stack-based-buffer-overflow-vulnerability-exists-in-the-boa)
- [Totolink X2000R OS command injection in formWizard](https://junglewise.ai/threats/cve-2026-9814-an-os-command-injection-vulnerability-exists-in-the-boa-formwizard)
- [TOTOLINK X2000R stack-based buffer overflow in boa formFilter](https://junglewise.ai/threats/cve-2026-9660-multiple-exploitable-stack-based-buffer-overflow-vulnerabilities)
- [TOTOLINK X2000R stack-based buffer overflow in boa formFilter](https://junglewise.ai/threats/cve-2026-9659-multiple-exploitable-stack-based-buffer-overflow-vulnerabilities)