QNAP Notes Station 3: Local privilege escalation via incorrect permissions
Summary
QNAP Notes Station 3 versions 3.9.x before 3.9.11 contain an incorrect permission assignment for a critical resource (CWE-732). A local user with a valid account on the NAS can exploit this flaw to gain higher privileges and compromise the system. The CNA rates it as high severity (CVSS 8.5), but the attacker needs a local account first.
Affected
- QNAP Notes Station 3 3.9.x before 3.9.11
- Default configuration: not affected according to the CNA record
Fixed in
- Notes Station 3 3.9.11 and later
Workaround
- No vendor workaround known.
- Until patched, remove unused user accounts and shared or guest accounts on the NAS, since the flaw requires a valid local user account.
Exploitation
- No known exploitation in the wild. CISA SSVC: exploitation none, automatable no, technical impact total.
- No public proof of concept found.
- One unverified social media mention of CVE-2026-34008 exists; its content could not be verified.
- EPSS: 0.00121.
Our recommendation
- Inventory QNAP NAS devices and the installed Notes Station 3 version.
- Update Notes Station 3 to 3.9.12 or later, which also covers CVE-2026-39991.
- Review the QNAP PHP advisory QSA-26-18 and apply any fixes it lists for Notes Station 3; confirm the fixed version with QNAP first.
- Review user accounts on each NAS and remove unused or shared ones.
- Keep NAS management and remote access off the internet where possible.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- QNAP Notes Station 3 release notes www.qnap.com
- VulDB entry 420587 vuldb.com
- Vulners CNA record CVE-2026-34008 vulners.com
- OpenCVE CVE-2026-34008 app.opencve.io
- OffSeq Radar CVE-2026-34008 radar.offseq.com
- AppleInsider on QNAP PHP vulnerabilities appleinsider.com
- VulDB entry 420591 (CVE-2026-39991) vuldb.com
- OffSeq Radar CVE-2026-39991 radar.offseq.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 10:32.
Original description (NVD)
An incorrect permission assignment for critical resource vulnerability has been reported to affect Notes Station 3. If a local attacker gains a user 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
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.