AEGLIX vulnerability intelligence
CVE-2026-86060
CRITICAL · CVSS 9.2 · Analyzed
Published: 2026-09-05 · Updated: 2026-09-11 · Source: NVD
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Vulnerability overview
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)
Severity and scoring
- CVSS score
- 9.2 · CRITICAL
- CVSS version
- 4.0
- CVSS 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/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
- Weaknesses
- CWE-88
CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.
Known exploitation and remediation
Listed in CISA’s Known Exploited Vulnerabilities catalog.
- Affected product
- MikroTik · RouterOS
- Added to catalog
- 2026-09-10
- Required action
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- CISA remediation due date
- 2026-09-13
CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.
Verify affected versions and patch availability in the vendor advisory before making changes.
Affected products and versions
cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*
From (inclusive): 6.0
Before (exclusive): 6.49.21
cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*
From (inclusive): 7.0
Before (exclusive): 7.23.4
cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*
From (inclusive): 7.24
Before (exclusive): 7.24.2
These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.
Advisories and references
- https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve
Third Party Advisory
- https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/
Mitigation · Third Party Advisory
- https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802
Release Notes
- https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801
Release Notes
- https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800
Release Notes
- https://mikrotik.com/supportsec/september-2026-vulnerability/
Vendor Advisory
- https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/
Exploit · Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-86060
US Government Resource