# CVE-2026-105286: Totolink A3002MU path traversal in file upload handler

Source: https://junglewise.ai/threats/cve-2026-105286-a-vulnerability-was-detected-in-totolink-a3002mu-1-0-0-b20230403  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-05. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-105286 · Severity: medium · CVSS 6.3 · Published 2026-10-05

The Totolink A3002MU router's web-based file upload feature does not validate file paths, allowing an attacker to write arbitrary files to the device's web root and overwrite system files. An unauthenticated remote attacker can exploit this to inject malicious content, phish for administrator credentials, execute code as root, or persistently deface the device.

Technologies: [TOTOLINK A3002MU](https://junglewise.ai/threats/technologies/a3002mu). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-105286 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105286 being exploited in the wild.

**How severe is CVE-2026-105286?** Medium severity, with a CVSS score of 6.3, published 5 October 2026.

**Which products and versions are affected?** TOTOLINK A3002MU 1.0.0-B20230403.1455.

**Is there a fix for CVE-2026-105286?** 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-2026-105286 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-105286?** Check whether you run TOTOLINK A3002MU 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 in the /boafrm/formUploadFile handler extracts the filename attribute from multipart upload requests without filtering ".." or "/" characters, then concatenates it directly into the destination path /var/web/fw/<product>/<filename>. The handler runs as root and permits writing arbitrary bytes after a minimal container structure, giving attackers full control over file path and content. No authentication is required.

## Affected products

- Totolink A3002MU 1.0.0-B20230403.1455

## Timeline

- 2026-09-14: disclosed
- 2026-10-05: advisory

## References

- [https://gist.github.com/H3rmesk1t/b107cde70392e0aff26e8219bae1a181](https://gist.github.com/H3rmesk1t/b107cde70392e0aff26e8219bae1a181)
- [https://vuldb.com/cve/CVE-2026-105286](https://vuldb.com/cve/CVE-2026-105286)

## Related threats

- [Totolink A3002MU stack buffer overflow in QoS handler](https://junglewise.ai/threats/cve-2026-105285-a-security-vulnerability-has-been-detected-in-totolink-a3002mu-1)
- [Totolink A3002MU authentication bypass in bin/boa](https://junglewise.ai/threats/cve-2026-105284-a-weakness-has-been-identified-in-totolink-a3002mu-1-0-0)
- [Totolink A3002MU command injection in formWsc](https://junglewise.ai/threats/cve-2026-93742-a-weakness-has-been-identified-in-totolink-a3002mu-hh-b20211125)
- [Totolink A3002MU buffer overflow in formWlWds](https://junglewise.ai/threats/cve-2026-93741-a-security-flaw-has-been-discovered-in-totolink-a3002mu-hh)
- [Totolink A3002MU buffer overflow in formWlEncrypt](https://junglewise.ai/threats/cve-2026-93740-a-vulnerability-was-identified-in-totolink-a3002mu-hh-b20211125)