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CVE-2026-67276 Details

Description

RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking the key type and modulus but omitting the exponent. Because signature verification uses the client-supplied key, an attacker knowing an authorized RSA modulus can supply a key with exponent one, forge a valid signature, and open an SSH command channel as the target user without the private key.This issue affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve	[email protected]	Third Party Advisory
https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/	[email protected]	MitigationThird Party Advisory
https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801	[email protected]	Release Notes
https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800	[email protected]	Release Notes
https://mikrotik.com/supportsec/september-2026-vulnerability/	[email protected]	Vendor Advisory
https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/	[email protected]	ExploitThird Party Advisory

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-347	Improper Verification of Cryptographic Signature	[email protected]

Affected Products

Product	Versions
mikrotik routeros	>= 7.9, < 7.23.4 >= 7.24, < 7.24.2
CPE cpe:2.3:o:mikrotik:routeros:::::::: Remediation No remediation found in references.

Change History

6 change records found show changes

Date	Action	Recorded By
Sep 25, 2026	Initial Analysis	[email protected]
Sep 9, 2026	CVE Modified	CISA-ADP
Sep 8, 2026	CVE Modified	CISA-ADP
Sep 7, 2026	CVE Modified	[email protected]
Sep 5, 2026	CVE Modified	[email protected]
Sep 5, 2026	New CVE Received	[email protected]