CASCACascade Atlas

Evidence dossier

CVE-2026-25108

FileZen contains an OS command injection vulnerability.

Exploited in the wild (CISA KEV since Feb 24, 2026). jpcert reports CVSS 4.0 8.7. EPSS estimates 5.0% exploit likelihood as of Aug 27, 2026.

68.9–71.5Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

FileZen contains an OS command injection vulnerability. When FileZen Antivirus Check Option is enabled, a logged-in user may send a specially crafted HTTP request to execute an arbitrary OS command.

State
PUBLISHED
Published
Feb 13, 2026
Updated
Feb 26, 2026
Evidence coverage
90%

Evidence chronology

What was known when

Download this view's receipt →
  1. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    jpcert

    Record text: FileZen contains an OS command injection vulnerability. When FileZen Antivirus Check Option is enabled, a logged-in user may send a specially crafted HTTP request to execute an arbitrary OS command.

    Inspect raw assertion
    Field
    container
    Value
    FileZen contains an OS command injection vulnerability. When FileZen Antivirus Check Option is enabled, a logged-in user may send a specially crafted HTTP request to execute an arbitrary OS command.
    Original evidence ↗
  3. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Soliton Systems K.K FileZen OS Command Injection Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Soliton Systems K.K FileZen OS Command Injection Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 4.98% probability · 91.57th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.049790000000; percentile 0.915730000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Feb 24, 2026 · first observed Jul 19, 2026

Exploit likelihood4.98%

FIRST EPSS · score date Aug 27, 2026 · 91.6th percentile · first observed Aug 27, 2026

SeverityCVSS 8.7

jpcert · CVSS 4.0 · first observed Jul 19, 2026 · same-version scores align in this snapshot

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1
Exploitation statusEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Severity assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 2026
Resolution
None
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Aug 27, 2026
Resolution
Resolve identity

Source comparison

Who said what

CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
jpcertOriginal assertion
Record text

FileZen contains an OS command injection vulnerability. When FileZen Antivirus Check Option is enabled, a logged-in user may send a specially crafted HTTP request to execute an arbitrary OS command.

Inspect raw assertion
Field
container
Value
FileZen contains an OS command injection vulnerability. When FileZen Antivirus Check Option is enabled, a logged-in user may send a specially crafted HTTP request to execute an arbitrary OS command.
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Soliton Systems K.K FileZen OS Command Injection Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Soliton Systems K.K FileZen OS Command Injection Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

4.98% probability · 91.57th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.049790000000; percentile 0.915730000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
1Underlying assertions
1Canonical products
1Target assertions
0Constraint assertions

Grouped from 1 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

3 scope groups

jpcert · source assertedSoliton Systems K.K.FileZenDirect source scope
Affected: V5.0.0 to V5.0.10
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "V5.0.0 to V5.0.10"}]
jpcert · source assertedSoliton Systems K.K.FileZenDirect source scope
Affected: V4.2.1 to V4.2.8
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "V4.2.1 to V4.2.8"}]
NVD CPE · APPLICATIONsolitonfilezenVulnerable target · 1 assertions
Any version (unconstrained) (>= 4.2.1, < 5.0.11)Canonical identity product-7cf8473f269807d1a461ee59c0251ee331e91ac27e6aff6ce54d6991dd7348eeLinked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:a:soliton:filezen:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    from including 4.2.1; through excluding 5.0.11
    Match ID
    4c8030a0-947b-4ffa-b406-ff1c1a9c8812

Affected-product evidence

Accepted scope and product mapping

1 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-0a5932268c6e6e1a05bbf7efa6cb39a8916fe4f608e1e228b76d942142371545 · product-7cf8473f269807d1a461ee59c0251ee331e91ac27e6aff6ce54d6991dd7348ee

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
60f65a9e-2ceb-4e8e-9638-8fc97c21996f
Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
e91bffc4-b948-4ccf-bf27-41b03f24bacff8061bd9-15fc-4acc-8f64-6fdd656d5bca

Assessments

CVSS by origin

8.8
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7
vultures@jpcert.or.jpCVSS 4.0 · role Secondary · priority eligiblevalid_matchCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
8.8
vultures@jpcert.or.jpCVSS 3.0 · role Secondary · priority eligiblevalid_matchCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7
jpcertCVSS 4.0 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8
jpcertCVSS 3.0 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Direct CVE/CNA normalized decisions

8.7Priority eligible

jpcert

CVSS 4.0 · Primary · Original assertion · rank 1

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Validation
Valid match
Recomputed
8.7
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1
8.8Priority eligible

jpcert

CVSS 3.0 · Primary · Original assertion · rank 1

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Validation
Valid match
Recomputed
8.8
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

  • 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; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • 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.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.