# CVE-2018-19953

If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed the issue in the following QTS versions. QTS 4.4.2.1231 on build 20200302; QTS 4.4.1.1201 on build 20200130; QTS 4.3.6.1218 on build 20200214; QTS 4.3.4.1190 on build 20200107; QTS 4.3.3.1161 on build 20200109; QTS 4.2.6 on build 20200109.

- Page: https://www.vulneraibility.com/cve/CVE-2018-19953
- CVSS: 6.1
- Known exploited: yes, in CISA KEV since 2022-05-24; CISA due date 2022-06-14; known ransomware use
- EPSS: 30.53% (percentile 98.3)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2026-08-13)
- Weakness: CWE-79, CWE-80
- Published: 2020-10-28

## Affected versions

- QNAP Systems Inc. QTS: affected < 4.4.2.1231; < 4.4.1.1201; < 4.3.6.1218; < 4.3.4.1190; < 4.3.3.1161; < 4.2.6

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://www.qnap.com/zh-tw/security-advisory/qsa-20-01
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19953

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.