# CVE-2026-120228: WAVLINK WN553X1-B command injection in ioos service

Source: https://junglewise.ai/threats/cve-2026-120228-a-flaw-has-been-found-in-wavlink-wn553x1-b-v260403-2-0-0-this  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-01. Updated: 2026-11-01  
License: CC BY 4.0 with a link back

CVE-2026-120228 · Severity: critical · CVSS 9.9 · Published 2026-11-01

The WAVLINK WN553X1-B WiFi router contains a command injection vulnerability in its web-based management interface. An authenticated attacker can inject arbitrary shell commands through the router's OpenVPN configuration endpoint and execute them with root privileges, leading to complete device compromise including data theft, remote access, and use as an attack platform.

Technologies: [Wavlink WN553X1-B](https://junglewise.ai/threats/technologies/wn553x1-b). Vendors: [Wavlink](https://junglewise.ai/threats/vendors/wavlink).

## Quick answers

**Is CVE-2026-120228 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-120228 being exploited in the wild.

**How severe is CVE-2026-120228?** Critical severity, with a CVSS score of 9.9, published 1 November 2026.

**Which products and versions are affected?** Wavlink WN553X1-B V260403_2.0.0.

**Is there a fix for CVE-2026-120228?** 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-2026-120228 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-120228?** Check whether you run Wavlink WN553X1-B 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

The vulnerability exists in the sub_416D88 function of /bin/ioos (the router's backend management service) where user-controlled group_id and group_name parameters are passed unsanitized into snprintf() then system() calls. By injecting a single quote and shell metacharacters (e.g., x';CMD;'), an authenticated attacker breaks out of the quoted string context in UCI commands and executes arbitrary OS commands as root. The same vulnerable pattern affects multiple handlers including wireguard_cli_group, ovpn_file, and check_pwd functions.

## Affected products

- WAVLINK WN553X1-B V260403_2.0.0

## Timeline

- 2026-11-01: disclosed

## References

- [https://github.com/senxitoyshuyi-ui/IOT-CVE/blob/main/vulns/WAVLINK%20WN553X1-B%20Router.md](https://github.com/senxitoyshuyi-ui/IOT-CVE/blob/main/vulns/WAVLINK%20WN553X1-B%20Router.md)
- [https://vuldb.com/cve/CVE-2026-120228](https://vuldb.com/cve/CVE-2026-120228)

## Related threats

- [WAVLINK WN553X1-B WireGuard command injection](https://junglewise.ai/threats/cve-2026-120240-a-vulnerability-was-determined-in-wavlink-wn553x1-b-v260403-2-0)
- [WAVLINK WN553X1-B WireGuard CLI command injection](https://junglewise.ai/threats/cve-2026-120239-a-vulnerability-was-found-in-wavlink-wn553x1-b-v260403-2-0-0)
- [WAVLINK WN553X1-B command injection in ovpn_file handler](https://junglewise.ai/threats/cve-2026-120238-a-vulnerability-has-been-found-in-wavlink-wn553x1-b-260403-2-0-0)
- [WAVLINK WN553X1-B OS command injection in OpenVPN CLI handler](https://junglewise.ai/threats/cve-2026-120231-a-vulnerability-was-determined-in-wavlink-wn553x1-b-v260403-2-0)
- [WAVLINK WN553X1-B os command injection in ioos](https://junglewise.ai/threats/cve-2026-120229-a-vulnerability-has-been-found-in-wavlink-wn553x1-b-260403-2-0-0)