TeamViewer Full Client and Host up to 15.79 Unattended Access improper authentication

Summaryinfo

A vulnerability has been found in TeamViewer Full Client and Host up to 15.79 and classified as critical. This affects an unknown part of the component Unattended Access. Performing a manipulation results in improper authentication. This vulnerability is reported as CVE-2026-12703. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in TeamViewer Full Client and Host up to 15.79. This affects an unknown part of the component Unattended Access. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at teamviewer.com. This vulnerability is uniquely identified as CVE-2026-12703 since 06/19/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Neither technical details nor an exploit are publicly available.

Upgrading to version 15.80 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• TeamViewer

Name

• Full Client and Host

Version

• 15.0
• 15.1
• 15.2
• 15.3
• 15.4
• 15.5
• 15.6
• 15.7
• 15.8
• 15.9
• 15.10
• 15.11
• 15.12
• 15.13
• 15.14
• 15.15
• 15.16
• 15.17
• 15.18
• 15.19
• 15.20
• 15.21
• 15.22
• 15.23
• 15.24
• 15.25
• 15.26
• 15.27
• 15.28
• 15.29
• 15.30
• 15.31
• 15.32
• 15.33
• 15.34
• 15.35
• 15.36
• 15.37
• 15.38
• 15.39
• 15.40
• 15.41
• 15.42
• 15.43
• 15.44
• 15.45
• 15.46
• 15.47
• 15.48
• 15.49
• 15.50
• 15.51
• 15.52
• 15.53
• 15.54
• 15.55
• 15.56
• 15.57
• 15.58
• 15.59
• 15.60
• 15.61
• 15.62
• 15.63
• 15.64
• 15.65
• 15.66
• 15.67
• 15.68
• 15.69
• 15.70
• 15.71
• 15.72
• 15.73
• 15.74
• 15.75
• 15.76
• 15.77
• 15.78
• 15.79

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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