CASCACascade Atlas

Evidence dossier

CVE-2021-26086

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint.

Exploited in the wild (CISA KEV since Nov 12, 2024). NVD reports CVSS 3.1 5.3. EPSS estimates 100.0% exploit likelihood as of Aug 6, 2026.

76.8–82.2Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.

State
PUBLISHED
Published
Aug 16, 2021
Updated
Oct 21, 2025
Evidence coverage
91%

Evidence chronology

What was known when

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

    Record text: Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.

    Inspect raw assertion
    Field
    container
    Value
    Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.
    Original evidence ↗
  2. 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 ↗
  3. Source dateSource date omittedFirst observed by CASCA
    CVE Program

    Record text: CVE Program Container

    Inspect raw assertion
    Field
    container
    Value
    CVE Program Container
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Atlassian Jira Server and Data Center Path Traversal Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Atlassian Jira Server and Data Center Path Traversal Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 100% probability · 99.99th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.999990000000; percentile 0.999920000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Nov 12, 2024 · first observed Jul 19, 2026

Exploit likelihood100.00%

FIRST EPSS · score date Aug 6, 2026 · 100th percentile · first observed Aug 6, 2026

SeverityCVSS 5.3

NVD · CVSS 3.1 · 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

atlassianOriginal assertion
Record text

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.

Inspect raw assertion
Field
container
Value
Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
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 ↗
CVE ProgramDerivative copy
Record text

CVE Program Container

Inspect raw assertion
Field
container
Value
CVE Program Container
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Atlassian Jira Server and Data Center Path Traversal Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Atlassian Jira Server and Data Center Path Traversal Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

100% probability · 99.99th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.999990000000; percentile 0.999920000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
6Underlying assertions
2Canonical products
6Target 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

10 scope groups

CISA-ADP · source assertedatlassianjira_data_centerDirect source scope
Affected: 0 to before 8.5.14 (custom comparison)Affected: 8.6.0 to before 8.13.6 (custom comparison)Affected: 8.14.0 to before 8.16.1 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "0", "lessThan": "8.5.14", "versionType": "custom"}, {"status": "affected", "version": "8.6.0", "lessThan": "8.13.6", "versionType": "custom"}, {"status": "affected", "version": "8.14.0", "lessThan": "8.16.1", "versionType": "custom"}]
CISA-ADP · source assertedatlassianjira_data_centerDirect source scope
Affected: 0 to before 8.5.14 (custom comparison)Affected: 8.6.0 to before 8.13.6 (custom comparison)Affected: 8.14.0 to before 8.16.1 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "0", "lessThan": "8.5.14", "versionType": "custom"}, {"status": "affected", "version": "8.6.0", "lessThan": "8.13.6", "versionType": "custom"}, {"status": "affected", "version": "8.14.0", "lessThan": "8.16.1", "versionType": "custom"}]
CISA-ADP · source assertedatlassianjira_data_centerDirect source scope
Affected: 0 to before 8.5.14 (custom comparison)Affected: 8.6.0 to before 8.13.6 (custom comparison)Affected: 8.14.0 to before 8.16.1 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "0", "lessThan": "8.5.14", "versionType": "custom"}, {"status": "affected", "version": "8.6.0", "lessThan": "8.13.6", "versionType": "custom"}, {"status": "affected", "version": "8.14.0", "lessThan": "8.16.1", "versionType": "custom"}]
CISA-ADP · source assertedatlassianjira_serverDirect source scope
Affected: 0 to before 8.5.14 (custom comparison)Affected: 8.6.0 to before 8.13.6 (custom comparison)Affected: 8.14.0 to before 8.16.1 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "0", "lessThan": "8.5.14", "versionType": "custom"}, {"status": "affected", "version": "8.6.0", "lessThan": "8.13.6", "versionType": "custom"}, {"status": "affected", "version": "8.14.0", "lessThan": "8.16.1", "versionType": "custom"}]
CISA-ADP · source assertedatlassianjira_serverDirect source scope
Affected: 0 to before 8.5.14 (custom comparison)Affected: 8.6.0 to before 8.13.6 (custom comparison)Affected: 8.14.0 to before 8.16.1 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "0", "lessThan": "8.5.14", "versionType": "custom"}, {"status": "affected", "version": "8.6.0", "lessThan": "8.13.6", "versionType": "custom"}, {"status": "affected", "version": "8.14.0", "lessThan": "8.16.1", "versionType": "custom"}]
CISA-ADP · source assertedatlassianjira_serverDirect source scope
Affected: 0 to before 8.5.14 (custom comparison)Affected: 8.6.0 to before 8.13.6 (custom comparison)Affected: 8.14.0 to before 8.16.1 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "0", "lessThan": "8.5.14", "versionType": "custom"}, {"status": "affected", "version": "8.6.0", "lessThan": "8.13.6", "versionType": "custom"}, {"status": "affected", "version": "8.14.0", "lessThan": "8.16.1", "versionType": "custom"}]
atlassian · source assertedAtlassianJira Data CenterDirect source scope
Affected: unspecified to before 8.5.14 (custom comparison)Affected: 8.6.0 to before unspecified (custom comparison)Affected: unspecified to before 8.13.6 (custom comparison)Affected: 8.14.0 to before unspecified (custom comparison)Affected: unspecified to before 8.16.1 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "unspecified", "lessThan": "8.5.14", "versionType": "custom"}, {"status": "affected", "version": "8.6.0", "lessThan": "unspecified", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "8.13.6", "versionType": "custom"}, {"status": "affected", "version": "8.14.0", "lessThan": "unspecified", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "8.16.1", "versionType": "custom"}]
atlassian · source assertedAtlassianJira ServerDirect source scope
Affected: unspecified to before 8.5.14 (custom comparison)Affected: 8.6.0 to before unspecified (custom comparison)Affected: unspecified to before 8.13.6 (custom comparison)Affected: 8.14.0 to before unspecified (custom comparison)Affected: unspecified to before 8.16.1 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "unspecified", "lessThan": "8.5.14", "versionType": "custom"}, {"status": "affected", "version": "8.6.0", "lessThan": "unspecified", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "8.13.6", "versionType": "custom"}, {"status": "affected", "version": "8.14.0", "lessThan": "unspecified", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "8.16.1", "versionType": "custom"}]
NVD CPE · APPLICATIONatlassianjira_data_centerVulnerable target · 3 assertions
Any version (unconstrained) (>= 8.14.0, < 8.16.1); Any version (unconstrained) (< 8.5.14); Any version (unconstrained) (>= 8.6.0, < 8.13.6)Canonical identity product-707977f1ec876d2c4c9c4e8c459bd03728fdc0d12dbf8efa0af5c9788ec7aa89Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 8.6.0; through excluding 8.13.6
    Match ID
    940cc48e-ec7d-42e1-838c-011d1c8cef31
  2. cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    through excluding 8.5.14
    Match ID
    ceebdb04-3699-4e5c-bf60-7052f6409d1b
  3. cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    from including 8.14.0; through excluding 8.16.1
    Match ID
    ca85b28c-6370-4d3a-a053-aec6878971b4
NVD CPE · APPLICATIONatlassianjira_serverVulnerable target · 3 assertions
Any version (unconstrained) (>= 8.14.0, < 8.16.1); Any version (unconstrained) (< 8.5.14); Any version (unconstrained) (>= 8.6.0, < 8.13.6)Canonical identity product-988f1c079972b253c0c062a95e770b9de6e5b1de993607f643ce08cbbeeae3dbLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    through excluding 8.5.14
    Match ID
    d60cecc8-9041-4339-a764-7d8515c4120d
  2. cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    from including 8.14.0; through excluding 8.16.1
    Match ID
    703b1e15-8fc1-42f4-953d-0cf16829ab21
  3. cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    from including 8.6.0; through excluding 8.13.6
    Match ID
    753a6e31-7ead-443e-8fc4-d01bb97844d7

Affected-product evidence

Accepted scope and product mapping

2 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-2c6716ad07a7f126f6c3b10254124705a45f0fa6586f2803bb482afd1584ee5f · product-707977f1ec876d2c4c9c4e8c459bd03728fdc0d12dbf8efa0af5c9788ec7aa89

Source class
Nvd cpe vulnerable target
Assertions
3
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
605f4eee-acdb-41d8-ba85-d024e43d24fe85d8f254-f768-4fa6-80f9-7449e24216ded3366569-a330-4147-85c6-42d24e6e7590
Mapping establishedEvidence supported

vendor-2c6716ad07a7f126f6c3b10254124705a45f0fa6586f2803bb482afd1584ee5f · product-988f1c079972b253c0c062a95e770b9de6e5b1de993607f643ce08cbbeeae3db

Source class
Nvd cpe vulnerable target
Assertions
3
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
010489d7-39b3-41f2-ba9f-77715e40457c35e9362f-95ff-4711-a383-d4a7b9e126389fd625a2-df1c-44ea-9d2a-4293e559ba30
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
8
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
0119a42b-716d-4728-b369-2f7bbdd2682e11e320c6-efc7-43a2-8775-1bc4636c70a715993562-bb6d-4634-bdb2-3760e64278ec82775479-5e18-413b-bbdc-7e3f7ef3b245a6be8856-3a33-41fe-91f5-c126215bccd3dc3f2b92-8a43-4374-9b30-934a411a9981de9b4b16-3176-489c-8609-787cbf09fa47e105bf8d-66e6-4c74-8006-2afe1ca0c74b

Assessments

CVSS by origin

5.3
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3
CVE Program sourceCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3
CISA-ADPCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Direct CVE/CNA normalized decisions

5.3Priority eligible

CISA-ADP

CVSS 3.1 · Secondary · Independent enrichment · rank 2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Validation
Valid match
Recomputed
5.3
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.