Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (CWE-78)
Wavlink WL-WN530BE1-A firmware through M30BE1_V251117 contains an OS command injection vulnerability in the sub_23B54 function of the ioos binary. The unsanitized file_id parameter from /protocol.csp?opt=ovpn_file requests with type=del is passed directly to popen(), allowing command execution. Authentication can be bypassed by spoofing an IP-FROM: 127.0.0.1 header.
An unauthenticated remote attacker can send a crafted request with a forged IP-FROM: 127.0.0.1 header to bypass login and execute arbitrary OS commands as the root user.
There is no evidence that a public proof-of-concept exists. There is no evidence of proof of exploitation at the moment.
Update Wavlink WL-WN530BE1-A firmware to a version beyond M30BE1_V251117. Restrict network access to the device's management interface. Implement network-level controls to prevent spoofing of 127.0.0.1 source IP addresses or IP-FROM headers. Monitor for suspicious requests to /protocol.csp endpoints.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Feedly found the first article mentioning CVE-2026-113802 . See article
NVD published the first details for CVE-2026-113802
A CVSS base score of 9.8 has been assigned.
GitHub Advisories released a security advisory .
OS Command Injection in Wavlink WL-WN530BE1-A Firmware
CVE-2026-113802 — Wavlink WL-WN530BE1-A Unauthenticated OS Command Injection in ioos protocol.csp ovpn_file Handler
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