CVE-2026-67276 (GCVE-0-2026-67276)

Vulnerability from cvelistv5 – Published: 2026-09-05 20:00 – Updated: 2026-09-09 04:26
VLAI ENISA Previdian
Title
SSH user impersonation possible in Mikrotik RouterOS
Summary
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)
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 00:00 UTC
CWE
  • CWE-347 - Improper verification of cryptographic signature
Impacted products
Vendor Product Version CPE status
Mikrotik RouterOS Affected: 7.24 , < 7.24.2 (custom)
Affected: 7.9 , < 7.23.4 (custom)
    cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*
    cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-05 00:00
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2026-67276

Status: Confirmed

Status Updated: 2026-09-05 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2026-09-05
Asserted: 2026-09-05

Scope
Notes: MikroTrick | Affected: MikroTik / RouterOS | 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 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable) | Patched since: 2026/09/03 | Exploitation type: unknown | CWEs: CWE-347 | Origin source: CERT.PL | Notes: https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/

Evidence

Type: Csirt Report

Signal: Successful Exploitation

Confidence: 75%

Source: enisa-cnw-kev


Details
Cwes CWE-347
Euvd EUVD-2026-72024
Notes https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/
Catalog ENISA / EU CSIRTs Network (CNW) KEV JSON
Product RouterOS
Datereported 2026/09/05
Originsource CERT.PL
Patchedsince 2026/09/03
Vendorproject MikroTik
Exploitationtype unknown
Vulnerabilityname MikroTrick
Threatactorsexploiting

References

Created: 2026-09-05 22:00 UTC | Updated: 2026-09-05 22:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2026-67276

Status: Confirmed

Status Updated: 2026-09-10 16:25 UTC

Exploited: Yes


Timestamps
First Seen: 2026-09-10
Asserted: 2026-09-10

Scope
Notes: SSH user impersonation possible in Mikrotik RouterOS | Affected: Mikrotik / RouterOS | CVSS: 9.2 (CRITICAL) | EPSS: 0.00243 | Used in malware: unknown | Not yet in CISA KEV: True

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian


Details
Feed Previdian (previdian.com)
Title SSH user impersonation possible in Mikrotik RouterOS
Cve Id CVE-2026-67276
Vendor Mikrotik
Ghsa Id None
Product RouterOS
Added Date 2026-09-10T16:25:00.000Z
Cvss Score 9.2
Epss Score 0.00243
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.15479
Used In Malware unknown
Vulnerability Id CVE-2026-67276
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True

References

Created: 2026-09-11 17:00 UTC | Updated: 2026-09-11 17:00 UTC
Show details on NVD website

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          "providerMetadata": {
            "dateUpdated": "2026-09-07T13:08:00.264Z",
            "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
            "shortName": "CERT-PL"
          },
          "references": [
            {
              "tags": [
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              "url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve"
            },
            {
              "tags": [
                "technical-description"
              ],
              "url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/"
            },
            {
              "tags": [
                "exploit"
              ],
              "url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"
            },
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://mikrotik.com/supportsec/september-2026-vulnerability/"
            },
            {
              "tags": [
                "release-notes"
              ],
              "url": "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801"
            },
            {
              "tags": [
                "release-notes"
              ],
              "url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800"
            }
          ],
          "source": {
            "discovery": "INTERNAL"
          },
          "title": "SSH user impersonation possible in Mikrotik RouterOS",
          "x_generator": {
            "engine": "Vulnogram 1.0.3"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
        "assignerShortName": "CERT-PL",
        "cveId": "CVE-2026-67276",
        "datePublished": "2026-09-05T20:00:55.811Z",
        "dateReserved": "2026-07-29T11:59:30.538Z",
        "dateUpdated": "2026-09-08T14:48:59.676Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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