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QNAP says administrators should update Qsync Central to the latest version offered in App Center. Its QSA-26-02 advisory identifies Qsync Central 5.0.x as affected and lists version 5.0.0.4, released January 20, 2026, and later as fixed. The advisory was released February 12, 2026, and is marked Resolved with an overall severity of Moderate. Read QNAP’s advisory.
Is my QNAP Qsync Central version affected?
QNAP identifies Qsync Central 5.0.x as affected by the issues in QSA-26-02. Its fixed-version threshold is Qsync Central 5.0.0.4, dated 2026/01/20, and later. Because the version available through App Center can change, check the current offered update rather than treating 5.0.0.4 as the latest release.
| # | Preview | Product | Price | |
|---|---|---|---|---|
| 1 |
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QNAP TR-004 4 Bay USB Type-C Direct Attached Storage (DAS) with hardware RAID (Diskless) | $219.00 | Buy on Amazon |
| 2 |
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QNAP TS-216G-US 2-Bay 2.5GbE Desktop NAS | $299.00 | Buy on Amazon |
| 3 |
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QNAP TS-264-8G-US 2 Bay Desktop NAS | $489.00 | Buy on Amazon |
| 4 |
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QNAP TS-233-US 2 Bay Desktop NAS | Buy on Amazon |
QTS and QuTS hero appear in QNAP’s instructions for updating the application; the advisory does not identify a separate vulnerability in either operating system.
What do the vulnerabilities allow?
QNAP groups the issues into several vulnerability classes, including buffer overflows, out-of-bounds reads and writes, format-string flaws, null-pointer dereferences, uncontrolled resource use, out-of-range pointer offsets, unthrottled allocation, and relative path traversal. Depending on the issue, the stated effects include reading secret or unexpected files, modifying or corrupting memory, crashing processes, and denial of service. The summary describes account requirements for the remote scenarios; it does not establish unauthenticated remote code execution or active exploitation.
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- Direct-attached storage device via USB Type-C for Windows, macOS and Linux
- Use the TR-004 as external storage for NAS backup
- Expand the capacity of your QNAP NAS
- 4 x 3.5-inch SATA 3Gb/s (Diskless)
- Hardware RAID supports RAID 0, 1, 5, JBOD, and individual disks
Two CVEs with individual NVD scores
- CVE-2025-52868: NVD describes a buffer overflow that can permit memory modification or cause process crashes. NVD assigns it a CVSS v3.1 base score of 8.1 (High). The described remote attack requires the attacker to first obtain a user account. NVD’s CVE-2025-52868 record.
- CVE-2025-30276: NVD describes an out-of-bounds write that can modify or corrupt memory. NVD assigns it a CVSS v3.1 base score of 8.8 (High). The described remote attack also requires the attacker to first obtain a user account. NVD’s CVE-2025-30276 record.
Why does QNAP say Moderate when a CVE score is High?
These labels refer to different ratings. QNAP marks the overall QSA-26-02 advisory Moderate, while NVD rates the two CVEs above individually as High under CVSS v3.1. The advisory’s label and each CVE’s score should not be treated as interchangeable measures.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do I update Qsync Central on QTS or QuTS hero?
- Sign in to QTS or QuTS hero with an administrator account.
- Open App Center.
- Search for Qsync Central.
- Select Update if it is offered, then confirm the update.
QNAP says the Update option is not displayed when Qsync Central is already up to date. If no update is offered, check the installed application version against QNAP’s advisory and consult App Center again for the current release.
Quick Recap
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- Budget-friendly Home NAS for file storage and multimedia streaming
- Centrally store and organize personal or family photos, music, and videos
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
