Vulnerability-Lookup

CVE-2026-5268 (GCVE-0-2026-5268)

Vulnerability from cvelistv5 – Published: 2026-07-06 15:25 – Updated: 2026-07-08 20:18

Title

SFTP Server Authentication Weakness

Summary

An authentication bypass vulnerability exists in the default SFTP server component utilized across the Ciena products listed. This vulnerability allows a remote, unauthenticated attacker to bypass security controls and gain unauthorized access to the underlying filesystem. Successful exploitation could allow an attacker to read or modify system files.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-06 18:42 UTC

CWE

CWE-288 - Authentication bypass using an alternate path or channel

Assigner

Ciena mitre root Scorecard

References

1 reference

URL	Tags
https://www.ciena.com/product-security	vendor-advisory

Impacted products

4 products

Vendor	Product	Version	CPE status
CIENA	6500 S-Series	Affected: R16.96 and prior	guessed
CIENA	6500 T-Series	Affected: R16.1 and prior	guessed
CIENA	PTS	Affected: R16.1 and prior	guessed
CIENA	CPL	Affected: R12.63 and prior	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-5268

Vulnerability from fkie_nvd - Published: 2026-07-06 16:16 - Updated: 2026-07-08 21:16

Severity

9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	7bd90cf1-1651-495e-9ae8-9415fb3c9feb	https://www.ciena.com/product-security

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "6500 S-Series",
          "vendor": "CIENA",
          "versions": [
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        },
        {
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          "vendor": "CIENA",
          "versions": [
            {
              "status": "affected",
              "version": "R16.1 and prior"
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          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "PTS",
          "vendor": "CIENA",
          "versions": [
            {
              "status": "affected",
              "version": "R16.1 and prior"
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          ]
        },
        {
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          "product": "CPL",
          "vendor": "CIENA",
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            {
              "status": "affected",
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    }
  ],
  "id": "CVE-2026-5268",
  "lastModified": "2026-07-08T21:16:54.663",
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GHSA-M6C7-7XHP-6VHC

Vulnerability from github – Published: 2026-07-06 18:31 – Updated: 2026-07-06 21:30

Details

Severity

9.1 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-5268"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-288"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-06T16:16:38Z",
    "severity": "CRITICAL"
  },
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  "id": "GHSA-m6c7-7xhp-6vhc",
  "modified": "2026-07-06T21:30:37Z",
  "published": "2026-07-06T18:31:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5268"
    },
    {
      "type": "WEB",
      "url": "https://www.ciena.com/product-security"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

CVE-2026-5268 (GCVE-0-2026-5268)

FKIE_CVE-2026-5268

GHSA-M6C7-7XHP-6VHC

Tags

Sightings

Nomenclature

Related by attack behaviour