CASCACascade Atlas

Evidence dossier

CVE-2021-26084

CVE-2021-26084

78.7–99.5Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.

State
PUBLISHED
Published
Aug 30, 2021
Updated
Dec 16, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS100.00%

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

Source stateConflict visible

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

Source comparison

Who said what

atlassianoriginal assertion
container

In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

CISA KEVoriginal assertion
observed_exploitation

Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.999990000000; percentile 0.999930000000

Applicability

Cited product scope

Trace impact →
AtlassianConfluence Data Center
[{"status": "affected", "version": "unspecified", "lessThan": "6.13.23", "versionType": "custom"}, {"status": "affected", "version": "6.14.0", "lessThan": "unspecified", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "7.4.11", "versionType": "custom"}, {"status": "affected", "version": "7.5.0", "lessThan": "unspecified", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "7.11.6", "versionType": "custom"}, {"status": "affected", "version": "7.12.0", "lessThan": "unspecified", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "7.12.5", "versionType": "custom"}]unknown
AtlassianConfluence Server
[{"status": "affected", "version": "unspecified", "lessThan": "6.13.23", "versionType": "custom"}, {"status": "affected", "version": "6.14.0", "lessThan": "unspecified", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "7.4.11", "versionType": "custom"}, {"status": "affected", "version": "7.5.0", "lessThan": "unspecified", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "7.11.6", "versionType": "custom"}, {"status": "affected", "version": "7.12.0", "lessThan": "unspecified", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "7.12.5", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*; end excluding 6.13.23supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*; start including 6.14.0; end excluding 7.4.11supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*; start including 7.5.0; end excluding 7.11.6supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*; start including 7.12.0; end excluding 7.12.5supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*; end excluding 6.13.23supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*; start including 6.14.0; end excluding 7.4.11supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*; start including 7.5.0; end excluding 7.11.6supported
Unknown vendorUnknown product
cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*; start including 7.12.0; end excluding 7.12.5supported

Assessments

CVSS by origin

9.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.