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MikroTik RouterOS Argument Injection (CVE-2026-86060)
critical Tenable OT Security Plugin ID 506058
Synopsis
The remote OT asset is affected by a vulnerability.Description
RouterOS contains an argument-handling flaw in the SSH login path involving usernames that begin with a prohibited character, allowing for the trusted RouterOS policy mask to be changed, leading to privilege escalation. Exploitation requires an unauthenticated SSH session to reach the RouterOS login helper.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.
Solution
Refer to the vendor advisory.See Also
https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve
https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802
https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801
https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800
https://mikrotik.com/supportsec/september-2026-vulnerability/
http://www.nessus.org/u?1fe530bb
Plugin Details
Severity: Critical
ID: 506058
File Name: tenable_ot_mikrotik_CVE-2026-86060.nasl
Version: 1.3
Type: Remote
Family: Tenable.ot
Published: 10/5/2026
Updated: 10/6/2026
Supported Sensors: Tenable OT Security
Risk Information
VPR
Risk Factor: Critical
Score: 9.4
Percentile: 99.82
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 8.3
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-86060
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 9.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C
CVSS v4
Risk Factor: Critical
Base Score: 9.2
Threat Score: 9.2
Threat Vector: CVSS:4.0/E:A
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
CPE: cpe:/o:mikrotik:routeros:6, cpe:/o:mikrotik:routeros:7
Required KB Items: Tenable.ot/MikroTik
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 9/5/2026
Vulnerability Publication Date: 9/5/2026
CISA Known Exploited Vulnerability Due Dates: 9/13/2026
Reference Information
CVE: CVE-2026-86060
CWE: 88