FKIE_CVE-2026-23566

Vulnerability from fkie_nvd - Published: 2026-01-29 09:16 - Updated: 2026-06-17 10:21
Severity
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
A vulnerability in TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an attacker on the adjacent network to inject, tamper with, or forge log entries in \Nomad Branch.log via crafted data sent to the UDP network handler. This can impact log integrity and nonrepudiation.
References
psirt@teamviewer.comhttps://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001/Vendor Advisory
Impacted products
Vendor Product Version
teamviewer digital_employee_experience *
microsoft windows -
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "Content Distribution Service",
            "NomadBranch.exe"
          ],
          "platforms": [
            "Windows"
          ],
          "product": "DEX",
          "vendor": "TeamViewer",
          "versions": [
            {
              "lessThan": "26.1",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "psirt@teamviewer.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:teamviewer:digital_employee_experience:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "8E2A5CE4-D147-45E1-8D16-3257B6E79E70",
              "versionEndExcluding": "26.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an attacker on the adjacent network to inject, tamper with, or forge log entries in \\Nomad Branch.log via crafted data sent to the UDP network handler. This can impact log integrity and nonrepudiation."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en TeamViewer DEX Client (anteriormente 1E Client) - Servicio de Distribuci\u00f3n de Contenido (NomadBranch.exe) anterior a la versi\u00f3n 26.1 para Windows permite a un atacante en la red adyacente inyectar, manipular o falsificar entradas de registro en \\Nomad Branch.log a trav\u00e9s de datos manipulados enviados al manejador de red UDP. Esto puede impactar la integridad del registro y la no repudiaci\u00f3n."
    }
  ],
  "id": "CVE-2026-23566",
  "lastModified": "2026-06-17T10:21:47.227",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "psirt@teamviewer.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-23566",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-01-29T15:56:46.401061Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-01-29T09:16:04.217",
  "references": [
    {
      "source": "psirt@teamviewer.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001/"
    }
  ],
  "sourceIdentifier": "psirt@teamviewer.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ],
      "source": "psirt@teamviewer.com",
      "type": "Secondary"
    }
  ]
}


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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

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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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