TI-2026-58872 Aliases CVE-2026-86060 GHSA-6425-cjxv-52gp

SSH session privilege manipulation via a crafted username in Mikrotik RouterOS

CRITICAL 99Exploited in the wildCWE-88Published 2026-09-05 · Updated 2026-09-11

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-88.

Summary

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)

Why it matters now

Exploitation Active In CISA KEV since 2026-09-10CISA due date 2026-09-13

EPSS 0.06392 93rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA and NVD

Fix Fixed RouterOS (Mikrotik): 7.24.2, 7.23.4, 6.49.21

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Active
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
MikroTik	RouterOS	7.24 to before 7.24.2; 7.0.0 to before 7.23.4; 6.0.0 to before 6.49.21	7.24.2, 7.23.4, 6.49.21	Patch available	CNA

RouterOS VendorMikroTik Affected 7.24 to before 7.24.2; 7.0.0 to before 7.23.4; 6.0.0 to before 6.49.21 Fixed in 7.24.2, 7.23.4, 6.49.21 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:mikrotik:routeros::::::::	6.0 to before 6.49.21; 7.0 to before 7.23.4; 7.24 to before 7.24.2	Vulnerable	MikroTik

cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:* Versions 6.0 to before 6.49.21; 7.0 to before 7.23.4; 7.24 to before 7.24.2 Vulnerable ·MikroTik

Remediation

Fix · CNA RouterOS (Mikrotik) Fixed in 7.24.2, 7.23.4, 6.49.21

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2026-09-05
Mikrotik RouterOS — mikrotik.com/supportsec/september-2026-vulnerability
6 records Highest priority Priority CRITICAL 3 CRITICAL, 1 HIGH, 2 MEDIUM
Other records, highest priority first
- TI-2026-47574 Kernel memory disclosure and denial of service in MikroTik RouterOS btest servicePriority CRITICAL 95
- TI-2026-47576 SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOSPriority CRITICAL 88
- TI-2026-47577 Unauthenticated file read in Mikrotik RouterOSPriority HIGH 77
Show all 6 records → Advisory →

Timeline

2026-09-10 Added to CISA KEV
2026-10-02 Threatist record created from CVE-2026-86060
2026-10-03 Alias added: GHSA-6425-cjxv-52gp

References

Exploit 1

https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/

Advisory 3

Other 3

TI-2018-05369 A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS… KEVCVSS 3.1CRITICAL 9.8
TI-2018-10669 MikroTik RouterOS through 6.42 allows unauthenticated remote attackers to read arbitrary… KEVCVSS 3.1CRITICAL 9.1
TI-2026-47574 Kernel memory disclosure and denial of service in MikroTik RouterOS btest service KEVCVSS 4.0HIGH 8.8
TI-2026-47576 SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS KEVCVSS 4.0MEDIUM 6.9
TI-2022-22302 Out-of-bounds read in MicroTik RouterOS CVSS 3.1CRITICAL 9.8
TI-2017-14215 The Mikrotik RouterOS web server allows memory corruption in releases before Stable… CVSS 3.1CRITICAL 9.8

See all 87 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences