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CVE-2020-2503
Stored cross-site scripting vulnerability in QES
Critical9.0EPSS 0.79%
- Published
- Updated
- Reserved
- Assigned by
- qnap
Description
If exploited, this stored cross-site scripting vulnerability could allow remote attackers to inject malicious code in File Station. QNAP has already fixed these issues in QES 2.1.1 Build 20201006 and later.
Timeline
ID reserved
By qnap
- 13 months later
· 13 months later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| qnapCNA (assigner) | 3.1 | Critical9.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.79% · top 44% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.0.
Weakness
- CWE-79 Cross-site Scripting (XSS) (opens in a new tab)All about CWE-79 and its CVEs
- CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) (opens in a new tab)All about CWE-80 and its CVEs
- CWE-749 Exposed Dangerous Method or Function (opens in a new tab)All about CWE-749 and its CVEs
Affected products
- affected unspecified – < 2.1.1
What to do
Solution: QNAP has already fixed these issues in QES 2.1.1 Build 20201006 and later.
References (1)
- https://www.qnap.com/zh-tw/security-advisory/qsa-20-17 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-2503)Record last updated .