Vulnerability-Lookup

WID-SEC-W-2026-2563

Vulnerability from csaf_certbund - Published: 2026-07-28 22:00 - Updated: 2026-07-29 22:00

Summary

TeamViewer: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: TeamViewer ist eine Fernzugriffs- und Fernsteuerungssoftware, die die Wartung von Computern und anderen Geräten ermöglicht.

Angriff: Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in TeamViewer ausnutzen, um Sicherheitsvorkehrungen zu umgehen.

Betroffene Betriebssysteme: - MacOS X

CVE-2026-12703

Affected products

Known affected 2 products

Product	Identifier	Version	Remediation
TeamViewer TeamViewer Remote Host (macOS) <15.80 TeamViewer / TeamViewer		Remote Host (macOS) <15.80
TeamViewer TeamViewer Remote Full Client (macOS) <15.80 TeamViewer / TeamViewer		Remote Full Client (macOS) <15.80

References

3 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://www.teamviewer.com/en-us/resources/trust-…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "TeamViewer ist eine Fernzugriffs- und Fernsteuerungssoftware, die die Wartung von Computern und anderen Ger\u00e4ten erm\u00f6glicht.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in TeamViewer ausnutzen, um Sicherheitsvorkehrungen zu umgehen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- MacOS X",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-2563 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2563.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-2563 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2563"
      },
      {
        "category": "external",
        "summary": "Security Bulletins vom 2026-07-28",
        "url": "https://www.teamviewer.com/en-us/resources/trust-center/security-bulletins/tv-2026-1007/"
      }
    ],
    "source_lang": "en-US",
    "title": "TeamViewer: Schwachstelle erm\u00f6glicht Umgehen von Sicherheitsvorkehrungen",
    "tracking": {
      "current_release_date": "2026-07-29T22:00:00.000+00:00",
      "generator": {
        "date": "2026-07-30T09:10:23.265+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-2563",
      "initial_release_date": "2026-07-28T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-07-28T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-07-29T22:00:00.000+00:00",
          "number": "2",
          "summary": "Referenz(en) aufgenommen: EUVD-2026-50360"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "Remote Full Client (macOS)  \u003c15.80",
                "product": {
                  "name": "TeamViewer TeamViewer Remote Full Client (macOS)  \u003c15.80",
                  "product_id": "T057302"
                }
              },
              {
                "category": "product_version",
                "name": "Remote Full Client (macOS)  15.80",
                "product": {
                  "name": "TeamViewer TeamViewer Remote Full Client (macOS)  15.80",
                  "product_id": "T057302-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:teamviewer:teamviewer:remote_full_client_%2528macos%2529___15.80"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "Remote Host (macOS) \u003c15.80",
                "product": {
                  "name": "TeamViewer TeamViewer Remote Host (macOS) \u003c15.80",
                  "product_id": "T057304"
                }
              },
              {
                "category": "product_version",
                "name": "Remote Host (macOS) 15.80",
                "product": {
                  "name": "TeamViewer TeamViewer Remote Host (macOS) 15.80",
                  "product_id": "T057304-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:teamviewer:teamviewer:remote_host_%2528macos%2529__15.80"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "TeamViewer"
          }
        ],
        "category": "vendor",
        "name": "TeamViewer"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-12703",
      "product_status": {
        "known_affected": [
          "T057304",
          "T057302"
        ]
      },
      "release_date": "2026-07-28T22:00:00.000+00:00",
      "title": "CVE-2026-12703"
    }
  ]
}

CVE-2026-12703 (GCVE-0-2026-12703)

Vulnerability from cvelistv5 – Published: 2026-07-29 14:13 – Updated: 2026-07-29 15:07

Title

Bypass of 2FA for Connections via Unattended Access in TeamViewer for macOS

Summary

TeamViewer Full Client and Host for macOS before version 15.80 contain a business logic error that can allow an authenticated attacker to bypass a configured 2FA for Connections approval flow via Unattended Access and establish a remote connection to an affected macOS host.

Severity

8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-29 15:07 UTC

CWE

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

Assigner

TV Scorecard

References

1 reference

URL	Tags
https://www.teamviewer.com/en/resources/trust-cen…	vendor-advisory

Impacted products

3 products

Vendor	Product	Version
TeamViewer	Remote	Affected: 15.00 , < 15.80 (custom)
TeamViewer	Tensor	Affected: 15.00 , < 15.80 (custom)
TeamViewer	ONE	Affected: 15.00 , < 15.80 (custom)

Credits

We thank dameb for the discovery and responsible disclosure

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-12703",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-29T15:07:03.248622Z",
                "version": "2.0.3"
              },
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            }
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
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          "vendor": "TeamViewer",
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          "modules": [
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      "impacts": [
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            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

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.

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WID-SEC-W-2026-2563

CVE-2026-12703 (GCVE-0-2026-12703)

Tags

Sightings

Nomenclature

Related by attack behaviour