CASCACascade Atlas

Evidence dossier

CVE-2021-26086

CVE-2021-26086

72.5–88.2Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

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
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

FIRST EPSS100.00%

2026-07-18 · v2026.06.15 · percentile 100.0%

Source stateNo scored conflict

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

Source comparison

Who said what

atlassianoriginal assertion
container

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.

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

CISA KEVoriginal assertion
observed_exploitation

Atlassian Jira Server and Data Center Path Traversal Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.999990000000; percentile 0.999920000000

Applicability

Cited product scope

Trace impact →
atlassianjira_data_center
[{"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"}]unknown
atlassianjira_data_center
[{"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"}]unknown
atlassianjira_data_center
[{"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"}]unknown
atlassianjira_server
[{"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"}]unknown
atlassianjira_server
[{"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"}]unknown
atlassianjira_server
[{"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"}]unknown
AtlassianJira Data Center
[{"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"}]unknown
AtlassianJira Server
[{"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"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*; end excluding 8.5.14supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*; start including 8.6.0; end excluding 8.13.6supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*; start including 8.14.0; end excluding 8.16.1supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*; end excluding 8.5.14supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*; start including 8.6.0; end excluding 8.13.6supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*; start including 8.14.0; end excluding 8.16.1supported

Assessments

CVSS by origin

5.3
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS: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 unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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.