MikroTik RouterOS 7.20 < 7.23.4 / 7.24.x < 7.24.2 WebFig Unauthenticated File Read (CVE-2026-67281)

high Nessus Plugin ID 344586

Synopsis

The remote networking device is affected by an information disclosure vulnerability.

Description

According to its self-reported version, the remote networking device is running a version of MikroTik RouterOS 7.20 prior to 7.23.4, or 7.24.x prior to 7.24.2. It is, therefore, affected by an information disclosure vulnerability.

RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocated session retains a stale uninitialized principal pointer used for file authorization. An unauthenticated attacker can prepare the allocator so that the file-serving path dereferences this pointer with sufficient rights, then supply parent-directory components in an encrypted URI to escape the WebFig file namespace and disclose root-owned files, including configuration stores containing credentials. (CVE-2026-67281)

Note that Nessus has not tested for this issue but has instead relied only on the router's self-reported version number.

Solution

Upgrade to MikroTik RouterOS 7.23.4, 7.24.2 or later.

Plugin Details

Severity: High

ID: 344586

File Name: mikrotik_CVE-2026-67281.nasl

Version: 1.1

Type: Remote

Family: Misc.

Published: 9/10/2026

Updated: 9/10/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.64

CVSS v2

Risk Factor: Medium

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2026-67281

CVSS v3

Risk Factor: High

Base Score: 7.5

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

Vulnerability Information

CPE: cpe:/o:mikrotik:routeros

Required KB Items: MikroTik/RouterOS/Version

Patch Publication Date: 9/3/2026

Vulnerability Publication Date: 9/5/2026

Reference Information

CVE: CVE-2026-67281

Detections

Analytics