CVE-2026-23566 (GCVE-0-2026-23566)
Vulnerability from cvelistv5
Published
2026-01-29 08:46
Modified
2026-01-29 16:44
CWE
  • CWE-20 - Improper Input Validation
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.
Impacted products
Vendor Product Version
TeamViewer DEX Version: 0   < 26.1
Create a notification for this product.
Show details on NVD website


{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-23566",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-29T15:56:46.401061Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-29T16:44:19.585Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "Content Distribution Service",
            "NomadBranch.exe"
          ],
          "platforms": [
            "Windows"
          ],
          "product": "DEX",
          "vendor": "TeamViewer",
          "versions": [
            {
              "lessThan": "26.1",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Threat Hunt Team of Bank of America"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "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."
            }
          ],
          "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."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-153",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-153 Input Data Manipulation"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20 Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-29T08:46:02.075Z",
        "orgId": "13430f76-86eb-43b2-a71c-82c956ef31b6",
        "shortName": "TV"
      },
      "references": [
        {
          "url": "https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001/"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Update the TeamViewer DEX Client (1E Client) to the latest available version."
            }
          ],
          "value": "Update the TeamViewer DEX Client (1E Client) to the latest available version."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Log Injection in Content Distribution Service UDP Handler",
      "x_generator": {
        "engine": "Vulnogram 0.5.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "13430f76-86eb-43b2-a71c-82c956ef31b6",
    "assignerShortName": "TV",
    "cveId": "CVE-2026-23566",
    "datePublished": "2026-01-29T08:46:02.075Z",
    "dateReserved": "2026-01-14T13:54:40.322Z",
    "dateUpdated": "2026-01-29T16:44:19.585Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-23566\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-29T15:56:46.401061Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-29T15:56:49.011Z\"}}], \"cna\": {\"title\": \"Log Injection in Content Distribution Service UDP Handler\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Threat Hunt Team of Bank of America\"}], \"impacts\": [{\"capecId\": \"CAPEC-153\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-153 Input Data Manipulation\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.5, \"attackVector\": \"ADJACENT_NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"TeamViewer\", \"modules\": [\"Content Distribution Service\", \"NomadBranch.exe\"], \"product\": \"DEX\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"26.1\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows\"], \"defaultStatus\": \"unaffected\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Update the TeamViewer DEX Client (1E Client) to the latest available version.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Update the TeamViewer DEX Client (1E Client) to the latest available version.\", \"base64\": false}]}], \"references\": [{\"url\": \"https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001/\"}], \"x_generator\": {\"engine\": \"Vulnogram 0.5.0\"}, \"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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"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.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-20\", \"description\": \"CWE-20 Improper Input Validation\"}]}], \"providerMetadata\": {\"orgId\": \"13430f76-86eb-43b2-a71c-82c956ef31b6\", \"shortName\": \"TV\", \"dateUpdated\": \"2026-01-29T08:46:02.075Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23566\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-29T16:44:19.585Z\", \"dateReserved\": \"2026-01-14T13:54:40.322Z\", \"assignerOrgId\": \"13430f76-86eb-43b2-a71c-82c956ef31b6\", \"datePublished\": \"2026-01-29T08:46:02.075Z\", \"assignerShortName\": \"TV\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


Loading…

Loading…