Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2026-67276

SSH user impersonation possible in Mikrotik RouterOS

Mikrotik / RouterOS · affected before 7.24.2

Watch CVE-2026-67276 Browse KEV feed
Severity
CVSS 9.2 · Critical
Confidence
High
Exploit status
Exploited in the wild
EPSS
6.5%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-67276 is an unauthenticated SSH user impersonation possible in Mikrotik RouterOS. RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key,...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.

Who is affected?

Mikrotik / RouterOS affected before 7.24.2.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

SSH user impersonation possible in Mikrotik RouterOS

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)

Mikrotik Affected
RouterOS
Before 7.24.2 Before 7.23.4
View vendor advisory (opens in new tab)
Published
05 Sep 2026
Exploitation Reported
10 Sep 2026
Attack vector
Remote
Complexity
High
Privileges
None
User interaction
None

Tags

edge

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CERT Polska

Recorded 10 Sep 2026

A trusted third party reported exploitation.

Proof of concept available

CVE

Recorded 05 Sep 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CERT Polska First 2026-09-10 16:25 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

9.2 Critical

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS

6.5%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Verification of Cryptographic Signature CWE-347

Recent mention · The Hacker News

MikroTrick Chain Let Attackers Take Over MikroTik Routers Without a Password or SSH Key

Swati KhandelwalSep 23, 2026Vulnerability / Network Security Two MikroTik RouterOS SSH vulnerabilities chained together let attackers take full administrative control of Internet-exposed routers without a password, SSH key, or completed authentication. The chain, which CERT...

Read full advisory

All Mentions

Recent mention · The Hacker News

MikroTrick Chain Let Attackers Take Over MikroTik Routers Without a Password or SSH Key

The Hacker News · 23 Sep 2026

Swati KhandelwalSep 23, 2026Vulnerability / Network Security Two MikroTik RouterOS SSH vulnerabilities chained together let attackers take full administrative control of Internet-exposed routers without a password, SSH key, or completed authentication. The chain, which CERT Polska calls MikroTrick, combines an SSH state-machine flaw (CVE-2026-67279) with an argument-injection bug in the RouterOS login process (CVE-2026-86060). Attack logs date to at least September 2, one day before MikroTik shipped patches in RouterOS 6.49.21, 7.23.4, and 7.24.2. As previously reported, CERT Polska...

Recent mention · CERT Polska EN

Vulnerabilities in Mikrotik RouterOS software

CERT Polska EN · 05 Sep 2026

CERT Polska has found 6 vulnerabilities (from CVE-2026-67276 to CVE-2026-67279, CVE-2026-67281 and CVE-2026-86060) in Mikrotik RouterOS software.

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

RouterOS SSH RSA key-identity mismatch permits authentication with a forged key sharing an authorized modulus

pruva · Created 2026-09-24 17:06:19 UTC

Severity: CRITICAL | CVE: CVE-2026-67276 | Package: MikroTik RouterOS

HORKimhab/CVE-2026-67276

github · Created 2026-09-06 11:52:37 UTC · 0 stars · AI assessment 90%

CVE-2026-67276 - Draft or TODO

CVE Record exploit — npratley.net

cve · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 16:25 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  2. 20:10 UTC

    Public PoC available

    Public proof-of-concept code published

  3. 20:00 UTC

    CVE published

    Vulnerability disclosed publicly

  4. 11:59 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-67276

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-67276",
  "confidence": "High",
  "cvss_score": 9.2,
  "cvss_estimated": false,
  "epss_score": 0.06451,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}