High

CVE-2026-16444 — Improper Validation of File Paths in TeamViewer Desktop Clients

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.

Published Aug 26, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: TV

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Teamviewer

Full Client, Host, QuickSupport (v13 for Linux) and 7 more

CVSS base

7.5

High · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Teamviewer Full Client, Host, QuickSupport (v13 for Linux), Teamviewer Full Client, Host, QuickSupport (v13 for macOS), Teamviewer Full Client, Host, QuickSupport (v14 for Linux)…).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Exploitation requires user interaction: tighten email/web filtering and warn affected users.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Teamviewer	Full Client, Host, QuickSupport (v13 for Linux)	≥ 13.0 and < 13.2.153978	Vulnerable	CVE Program (cve.org) e CISA ADP
Teamviewer	Full Client, Host, QuickSupport (v13 for macOS)	≥ 13.0 and < 13.2.153981	Vulnerable	CVE Program (cve.org) e CISA ADP
Teamviewer	Full Client, Host, QuickSupport (v14 for Linux)	≥ 14.0 and < 14.7.48838	Vulnerable	CVE Program (cve.org) e CISA ADP
Teamviewer	Full Client, Host, QuickSupport (v14 for macOS)	≥ 14.0 and < 14.7.48838	Vulnerable	CVE Program (cve.org) e CISA ADP
Teamviewer	Full Client, Host, QuickSupport (v14 for Windows)	≥ 14.0 and < 14.7.48833	Vulnerable	CVE Program (cve.org) e CISA ADP
Teamviewer	Full Client, Host, QuickSupport & Portable	≥ 15.0 and < 15.81.5	Vulnerable	CVE Program (cve.org) e CISA ADP
Teamviewer	Full Client, Host, QuickSupport & Portable (for Windows 7 & 8)	≥ 15.64.0 and < 15.64.7	Vulnerable	CVE Program (cve.org) e CISA ADP
Teamviewer	Full Client, Host, QuickSupport & Portable (v13 for Windows)	≥ 13.0 and < 13.2.36229	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

High

Privileges required

None

User interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.5	CVSS 3.1	High	1.6	5.9	psirt@teamviewer.com via NIST National Vulnerability Database
7.5	CVSS 3.1	High	—	—	TV via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H (score shown at the top: psirt@teamviewer.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-73

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Affected products added · teamviewer/full client, host, quicksupport & portable, teamviewer/full client, host, quicksupport & portable (for window
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 7.5
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 26, 2026 · TV

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

1 on the record

www.teamviewer.com/de/resources/trust-center/security-bulletins/tv-2026-1008/
NIST National Vulnerability Database

Elsewhere on this site

Teamviewer
every CVE for this vendor

CWE-73
other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-16444 is "Improper Validation of File Paths in TeamViewer Desktop Clients", rated High. It affects Full Client, Host, QuickSupport (v13 for Linux) (Teamviewer); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.5 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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