Vulnerability · Published Nov 1, 2026 · Assigned by VulDB

CVE-2026-120240WAVLINK WN553X1-B WireGuard CLI Group ioos sub_41A748 os command injection

Critical 9.9

In plain English

A critical-severity OS command injection in WN553X1-B from WAVLINK. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 77% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical

Exploit odds (30 days)1.7%top 22.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability was determined in WAVLINK WN553X1-B V260403_2.0.0. This issue affects the function sub_41A748 of the file /bin/ioos of the component WireGuard CLI Group Handler. Executing a manipulation of the argument group_id/group_name can lead to os command injection. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure.

Affected products (as reported)

Vendor	Product	Versions
WAVLINK	WN553X1-B	V260403_2.0.0

Weakness: CWE-78, CWE-77 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-429599 | WAVLINK WN553X1-B WireGuard CLI Group ioos sub_41A748 os command injection vdb-entry, technical-description
VDB-429599 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-120240 | CVE Analysis and Report third-party-advisory
Submit #919251 | Wavlink Router Firmware V260403_2.0.0 Command Injection third-party-advisory
https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK%20WN553X1-B%20Router/WAVLINK_WN553X1-B_wireguard_cli_group_command_injection.md exploit