{"id":"CVE-2026-23566","state":"PUBLISHED","title":"Log Injection in Content Distribution Service UDP Handler","description":"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.","publishedAt":"2026-01-29T08:46:02.075Z","updatedAt":"2026-01-29T16:44:19.585Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","source":"TV"},"assigner":"TV","products":["TeamViewer DEX"],"affected":[{"vendor":"TeamViewer","product":"DEX","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"26.1","versionType":"custom"}],"modules":["Content Distribution Service","NomadBranch.exe"],"platforms":["Windows"]}],"references":["https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001/"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23566.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23566","state":"PUBLISHED","datePublished":"2026-01-29T08:46:02.075Z","dateUpdated":"2026-01-29T16:44:19.585Z","assignerShortName":"TV","assignerOrgId":"13430f76-86eb-43b2-a71c-82c956ef31b6","dateReserved":"2026-01-14T13:54:40.322Z"},"containers":{"cna":{"title":"Log Injection in Content Distribution Service UDP Handler","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."}],"affected":[{"vendor":"TeamViewer","product":"DEX","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"26.1","versionType":"custom"}],"modules":["Content Distribution Service","NomadBranch.exe"],"platforms":["Windows"]}],"references":[{"url":"https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001/"}],"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":{"shortName":"TV","orgId":"13430f76-86eb-43b2-a71c-82c956ef31b6","dateUpdated":"2026-01-29T08:46:02.075Z"},"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"}]}],"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"},"x_generator":{"engine":"Vulnogram 0.5.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-29T15:56:46.401061Z","id":"CVE-2026-23566","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-29T16:44:19.585Z"}}]}}}