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Fencer Vulns
high 7.5

CVE-2026-16444 json

Improper Validation of File Paths in TeamViewer Desktop Clients

published 2026-08-26 2 mo ago modified 2026-09-01 2 mo ago also EUVD-2026-66379

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

Improper neutralization of path traversal sequences in TeamViewer Desktop Clients prior Version 15.81.5 allows an authenticated remote session participant to write files to unintended locations on the local file system via file transfer or virtual file clipboard mechanisms. An attacker can leverage this behavior to achieve arbitrary file write and potentially execute code with the privileges of the affected user.

Patch / fix

  • TeamViewer Full Client, Host, QuickSupport & Portable 15.81.5
  • TeamViewer Full Client, Host, QuickSupport & Portable (for Windows 7 & 8) 15.64.7
  • TeamViewer Full Client, Host, QuickSupport (v14 for Windows) 14.7.48833
  • TeamViewer Full Client, Host, QuickSupport (v14 for Linux) 14.7.48838
  • TeamViewer Full Client, Host, QuickSupport (v14 for macOS) 14.7.48838
  • TeamViewer Full Client, Host, QuickSupport & Portable (v13 for Windows) 13.2.36229
  • TeamViewer Full Client, Host, QuickSupport (v13 for Linux) 13.2.153978
  • TeamViewer Full Client, Host, QuickSupport (v13 for macOS) 13.2.153981

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • TeamViewer Full Client, Host, QuickSupport & Portable
  • TeamViewer Full Client, Host, QuickSupport & Portable (for Windows 7 & 8)
  • TeamViewer Full Client, Host, QuickSupport (v14 for Windows)
  • TeamViewer Full Client, Host, QuickSupport (v14 for Linux)
  • TeamViewer Full Client, Host, QuickSupport (v14 for macOS)
  • TeamViewer Full Client, Host, QuickSupport & Portable (v13 for Windows)
  • TeamViewer Full Client, Host, QuickSupport (v13 for Linux)
  • TeamViewer Full Client, Host, QuickSupport (v13 for macOS)

Classification

Weakness
  • CWE-73 External Control of File Name or Path

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.