CASCACascade Atlas

Evidence dossier

CVE-2018-19953

CVE-2018-19953

60.5–80.0Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Oct 28, 2020
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS23.89%

2026-07-18 · v2026.06.15 · percentile 97.6%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

qnaporiginal assertion
container

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.

CISA KEVoriginal assertion
observed_exploitation

QNAP NAS File Station Cross-Site Scripting Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.238940000000; percentile 0.975790000000

Applicability

Cited product scope

Trace impact →
QNAP Systems Inc.QTS
[{"status": "affected", "version": "unspecified", "lessThan": "4.4.2.1231", "versionType": "custom"}]unknown
QNAP Systems Inc.QTS
[{"status": "affected", "version": "unspecified", "lessThan": "4.4.1.1201", "versionType": "custom"}]unknown
QNAP Systems Inc.QTS
[{"status": "affected", "version": "unspecified", "lessThan": "4.3.6.1218", "versionType": "custom"}]unknown
QNAP Systems Inc.QTS
[{"status": "affected", "version": "unspecified", "lessThan": "4.3.4.1190", "versionType": "custom"}]unknown
QNAP Systems Inc.QTS
[{"status": "affected", "version": "unspecified", "lessThan": "4.3.3.1161", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "4.2.6", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; end excluding 4.2.6supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; start including 4.3.1.0013; end excluding 4.3.3.1161supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; start including 4.3.4; end excluding 4.3.4.1190supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; start including 4.3.6; end excluding 4.3.6.1218supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; start including 4.4.0; end excluding 4.4.1.1201supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*; start including 4.4.2; end excluding 4.4.2.1231supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:-:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20170517:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20190322:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20190730:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20190921:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:qnap:qts:4.2.6:build_20191107:*:*:*:*:*:*supported

Assessments

CVSS by origin

6.1
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.