Detections
Analytics

LOYTEC L-IP BACnet/IP Routers Cross-site Scripting (CVE-2026-12496)

high Tenable OT Security Plugin ID 505943

Synopsis

The remote OT asset is affected by a vulnerability.

Description

An unauthenticated remote attacker can inject and store malicious JavaScript in the OPC XML-DA server statistics page (/webui/statistics/opc_srv) of a LOYTEC L-IP BACnet/IP router by sending a crafted 'User-Agent' header in a POST request to the device's '/da' endpoint. The script executes in an administrator's browser when the statistics page is later viewed, enabling session hijacking, credential theft, or device reconfiguration.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Upgrade to firmware version 8.4.18 or later.

See Also

http://www.nessus.org/u?4e9e8106

Plugin Details

Severity: High

ID: 505943

File Name: tenable_ot_loytecelectronics_CVE-2026-12496.nasl

Version: 1.3

Type: Remote

Family: Tenable.ot

Published: 9/7/2026

Updated: 10/8/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9.65

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.3

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:loytec:lip-me201c_firmware, cpe:/o:loytec:lip-me202c_firmware, cpe:/o:loytec:lip-me204c_firmware

Required KB Items: Tenable.ot/LOYTECElectronics

Exploit Ease: No known exploits are available

Patch Publication Date: 6/22/2026

Vulnerability Publication Date: 6/22/2026

Reference Information

CVE: CVE-2026-12496

CWE: 116, 79