Vulnerability-Lookup

CVE-2026-3873 (GCVE-0-2026-3873)

Vulnerability from cvelistv5 – Published: 2026-03-13 08:14 – Updated: 2026-03-13 16:05

Title

Legacy built-in user account

Summary

Use of Hard-coded Credentials vulnerability in Avantra allows Accessing Functionality Not Properly Constrained by ACLs. This issue affects Avantra: before 25.3.0.

Severity

7.2 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-13 16:05 UTC

CWE

CWE-798 - Use of Hard-coded Credentials

Assigner

NCSC.ch CNA under the mitre root

CNA scorecard B 80/100 over 74 records in the last 180 days details

References

1 reference

URL	Tags
https://support.avantra.com/hc/en-us/articles/535…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
syslink software AG	Avantra	Affected: 0 , < 25.3.0 (semver)	guessed

Credits

Vicxer Inc.

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-3873

Vulnerability from fkie_nvd - Published: 2026-03-13 19:55 - Updated: 2026-06-17 10:44

Severity

7.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Summary

Use of Hard-coded Credentials vulnerability in Avantra allows Accessing Functionality Not Properly Constrained by ACLs. This issue affects Avantra: before 25.3.0.

References

	URL	Tags
	vulnerability@ncsc.ch	https://support.avantra.com/hc/en-us/articles/5352465121695-Security-Notice-Legacy-Built-In-User-Account-rtm

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "Windows",
            "Linux"
          ],
          "product": "Avantra",
          "vendor": "syslink software AG",
          "versions": [
            {
              "lessThan": "25.3.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "vulnerability@ncsc.ch"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Use of Hard-coded Credentials vulnerability in Avantra allows Accessing \nFunctionality Not Properly Constrained by ACLs. This issue affects \nAvantra: before 25.3.0."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de uso de credenciales codificadas en Avantra permite acceder a funcionalidades no restringidas adecuadamente por ACLs. Este problema afecta a Avantra: versiones anteriores a la 25.3.0."
    }
  ],
  "id": "CVE-2026-3873",
  "lastModified": "2026-06-17T10:44:21.933",
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          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.2,
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          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
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          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.7,
        "source": "vulnerability@ncsc.ch",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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GHSA-Q26G-448C-9P4X

Vulnerability from github – Published: 2026-03-13 21:31 – Updated: 2026-03-13 21:31

Details

Use of Hard-coded Credentials vulnerability in Avantra allows Accessing Functionality Not Properly Constrained by ACLs. This issue affects Avantra: before 25.3.0.

Severity

7.2 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-3873"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-798"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-13T19:55:10Z",
    "severity": "HIGH"
  },
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  "id": "GHSA-q26g-448c-9p4x",
  "modified": "2026-03-13T21:31:51Z",
  "published": "2026-03-13T21:31:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3873"
    },
    {
      "type": "WEB",
      "url": "https://support.avantra.com/hc/en-us/articles/5352465121695-Security-Notice-Legacy-Built-In-User-Account-rtm"
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  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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

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Action not permitted

CVE-2026-3873 (GCVE-0-2026-3873)

FKIE_CVE-2026-3873

GHSA-Q26G-448C-9P4X

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour