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major vulnerability· requires attention

Impacts widely deployed Atlassian Data Center products (Jira, Confluence, Bitbucket, Bamboo, Crowd, Crucible, Fisheye); unauthenticated file access can expose secrets and enable further compromise.

Web

CVE-2026-21589

9.3
Critical
EPSS n/aPatch availableOct 6, 2026

Unauthenticated arbitrary file read in Atlassian Data Center apps.

common questions

Is CVE-2026-21589 being exploited?

Not confirmed. CVE-2026-21589 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.

How severe is CVE-2026-21589?

CVE-2026-21589 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-21589?

Yes. A fix has been recorded for CVE-2026-21589. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-21589 affect?

CVE-2026-21589 affects Bitbucket Data Center, Confluence Data Center, Jira Software Data Center, Jira Service Management Data Center, and 4 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-21589?

Upgrade to Atlassian fixed versions immediately; restrict external access and rotate exposed credentials.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
Bitbucket Data CenterConfluence Data CenterJira Software Data CenterJira Service Management Data CenterBamboo Data CenterCrowd Data CenterCrucibleFisheye
impact

Unauthenticated remote read of specific files in the webapp root (exact path required), exposing configs/keys/credentials and enabling data theft or lateral movement.

action required

Immediate action required

affected versions
Atlassian Bamboo Data Center
  • affectedAll other versions
vendor says fixed inPatch version 10.2.4 and later, Patch version 12.1.12 and later
Atlassian Bamboo Server
  • affectedAll versions
Atlassian Bitbucket Data Center
  • affectedAll other versions
vendor says fixed inPatch version 10.2.8 and later, Patch version 10.5.1 and later, Patch version 9.4.26 and later
Atlassian Bitbucket Server
  • affectedAll versions
Atlassian Confluence Data Center
  • affectedAll other versions
vendor says fixed inPatch version 10.2.19 and later, Patch version 9.2.26 and later
Atlassian Confluence Server
  • affectedAll versions
Atlassian Crowd Data Center
  • affectedAll other versions
vendor says fixed inPatch version 7.2.4 and later, Patch version 7.1.1 and later, Patch version 7.0.3 and later, Patch version 6.3.7 and later
Atlassian Crowd Server
  • affectedAll versions
Atlassian Crucible Data Center
  • affectedAll other versions
vendor says fixed inPatch version 4.9.15 and later
Atlassian Crucible Server
  • affectedAll other versions
vendor says fixed inPatch version 4.9.15 and later
Atlassian Fisheye Data Center
  • affectedAll other versions
vendor says fixed inPatch version 4.9.15 and later
Atlassian Fisheye Server
  • affectedAll other versions
vendor says fixed inPatch version 4.9.15 and later
Atlassian Jira Service Management Data Center
  • affectedAll other versions
vendor says fixed inPatch version 11.3.12 and later, Patch version 10.3.26 and later, Patch version 5.12.40 and later
Atlassian Jira Service Management Server
  • affectedAll other versions
vendor says fixed inPatch version 5.12.40 and later
Atlassian Jira Software Data Center
  • affectedAll other versions
vendor says fixed inPatch version 11.3.12 and later, Patch version 10.3.26 and later, Patch version 9.12.40 and later
Atlassian Jira Software Server
  • affectedAll other versions
vendor says fixed inPatch version 9.12.40 and later

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
NVDCVE.orgCVE DetailsSource
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