QNAP QcalAgent: Path traversal vulnerability
Summary
A path traversal vulnerability in QNAP QcalAgent versions before 1.1.10 allows an authenticated remote attacker to access files or system data outside the intended directories. The attacker needs a valid user account on the device, and the vector is network-based. The official CVE title also mentions arbitrary file move, Docker escape and host code execution, which would be far more severe than the description alone suggests; this is unverified and the impact should be confirmed before relying on the lower score.
Affected
- QcalAgent 1.1.x before 1.1.10 (per vendor CVE record)
- Earlier builds: Unknown.
Fixed in
- QcalAgent 1.1.10 and later
Workaround
- No vendor workaround known. Unknown.
- Interim measures (not from a source): do not expose the NAS directly to the internet, reduce user accounts with access, and disable QcalAgent if QCalendar is not used.
Exploitation
- CISA SSVC: exploitation none, not automatable, technical impact total.
- Not listed in the CISA KEV catalog according to one aggregator (to be confirmed in the KEV catalog itself).
- No public proof-of-concept confirmed at this time.
Our recommendation
- Inventory QNAP devices and check whether QcalAgent is installed and which version it runs.
- Update QcalAgent to version 1.1.10 or later, starting with internet-facing NAS devices.
- Review user accounts, remove unused ones and enforce strong passwords and MFA where supported.
- Monitor the NVD entry and QNAP advisories for confirmation of the impact and CVSS score.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- OpenCVE record CVE-2026-41544 app.opencve.io
- VulDB CVE-2026-41544 vuldb.com
- QNAP release notes QcalAgent www.qnap.com
- TheHackerWire CVE-2026-41544 www.thehackerwire.com
- Strix CVE-2026-41544 www.strix.ai
- QNAP QSA-23-34 www.qnap.com
- QNAP QSA-21-60 www.qnap.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, 02:36.
Original description (NVD)
A path traversal vulnerability has been reported to affect QcalAgent. If a remote attacker gains a user account, they can then exploit the vulnerability to read the contents of unexpected files or system data. We have already fixed the vulnerability in the following version: QcalAgent 1.1.10 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.
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