Stored XSS Vulnerability in Q'center

published 2021-07-01 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-15459

cvss: 5.4; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits: 0; none known

This issue affects: QNAP Systems Inc. Q'center versions prior to 1.11.1004.

Patch / fix

fixed in 1

QNAP Systems Inc. Q'center 1.11.1004

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	3.5	AV:N/AC:M/Au:S/C:N/I:P/A:N

Affected products

QNAP Systems Inc. Q'center

Classification

Weakness

CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page
CWE-79 Improper Neutralization of Input During Web Page Generation

References

qnap.com /zh-tw/security-advisory/qsa-21-31
vendor-advisory

Sources

CVE List CVE-2021-28803
NVD CVE-2021-28803

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary