SSH user impersonation possible in Mikrotik RouterOS (CVE-2026-67276) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-67276

SSH user impersonation possible in Mikrotik RouterOS

Answer in brief

CVE-2026-67276 records a Unknown severity vulnerability in SSH user impersonation possible in Mikrotik RouterOS. The current sources do not mark it as known exploited. The current feed maps Mikrotik/RouterOS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 5, 2026Updated Sep 5, 2026Source checked Sep 5, 2026First seen by HOL Sep 5, 2026Material review Sep 5, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Mikrotik/RouterOS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Mikrotik/RouterOSgeneric	>=7.24 <7.24.2 \|\| >=7.0.0 <7.23.4 \|\| >=6.0.0 <6.49.21	7.24.2, 7.23.4, 6.49.21

Recommended response

Check inventory. Check lockfiles and deployed manifests for Mikrotik/RouterOS.
Review the reported fix. Update Mikrotik/RouterOS to 7.24.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 5, 2026

Sources and claim methodology

Upstream source 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 was fixed in versions: 6.49.21 (Lont-term), 7.23.4 (Lont-term) and 7.24.2 (Stable)

Quoted source text, attributed separately from HOL analysis.