Notes Station 3 Improper Isolation Vulnerability (v<3.9.11)
CVE-2026-34009 Published on October 15, 2026
**Container Escape** Host user home directory mounted with write access into application container
An improper isolation or compartmentalization vulnerability has been reported to affect Notes Station 3. If a local attacker gains an administrator account, they can then exploit the vulnerability to compromise the security of the system.
We have already fixed the vulnerability in the following version:
Notes Station 3 3.9.11 and later
Vulnerability Analysis
CVE-2026-34009 can be exploited with local system access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is a Separation of Privilege Vulnerability?
The product does not sufficiently compartmentalize functionality or processes that require different privilege levels, rights, or permissions. When a weakness occurs in functionality that is accessible by lower-privileged users, then without strong boundaries, an attack might extend the scope of the damage to higher-privileged users.
CVE-2026-34009 has been classified to as a Separation of Privilege vulnerability or weakness.
Products Associated with CVE-2026-34009
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Affected Versions
QNAP Systems Inc. Notes Station 3:- Version 3.9.x and below 3.9.11 is affected.