Critical

CVE-2026-21589

Type: advisorySource: Official CVE ListKnown exploited1 source record

This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center. Crowd Data Center, Crucible and Fisheye. This Arbitrary File Access vulnerability allows an unauthenticated attacker to access specific files within the web application root directory in affected versions. Exploitation requires prior knowledge of the target file's exact name and path; this vulnerability does not allow attackers to enumerate or list directory contents. In some configurations, there may be some sensitive files that make this highly severe. This vulnerability allows an unauthenticated remote attacker to access specific files within the web application root directory in affected versions. The vulnerability must be addressed for affected versions of: -- Bitbucket Data Center, introduced in version >= 4.6.0, fix versions: 9.4.26, 10.2.8, 10.5.1 -- Confluence Data Center, introduced in version >= 5.10.0, fix versions 9.2.26, 10.2.19 -- Crowd Data Center, introduced in version >= 2.11.0, fix versions 6.3.7, 7.0.3, 7.1.7, 7.2.4 -- Jira Software Data Center, introduced in version >= 7.1.0, fix versions 9.12.40, 10.3.26, 11.3.12 -- Jira Service Management Data Center, introduced in version >= 3.1.0, fix versions 5.12.40, 10.3.26, 11.3.12 -- Bamboo Data Center >= 7.0.1, fix versions 10.2.24, 12.1.12 -- Crucible, fix versions 4.9.15 -- Fisheye, fix version 4.9.15 -- Exploitation requires prior knowledge of the target

Announced 5 Oct 2026Source revision 1

Original source ↗

CVE-2026-21589

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-21589

Bamboo Data Center

Source reference: /containers/cna/affected/0/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Bitbucket Data Center

Source reference: /containers/cna/affected/1/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Confluence Data Center

Source reference: /containers/cna/affected/2/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Crowd Data Center

Source reference: /containers/cna/affected/3/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Crucible Data Center

Source reference: /containers/cna/affected/4/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Fisheye Data Center

Source reference: /containers/cna/affected/5/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Jira Service Management Data Center

Source reference: /containers/cna/affected/6/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Jira Software Data Center

Source reference: /containers/cna/affected/7/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "Atlassian",
    "product": "Bamboo Data Center",
    "versions": [
      {
        "status": "affected",
        "version": "All other versions"
      },
      {
        "status": "unaffected",
        "version": "Patch version 10.2.24 and later"
      },
      {
        "status": "unaffected",
        "version": "Patch version 12.1.12 and later"
      }
    ]
  },
  {
    "vendor": "Atlassian",
    "product": "Bitbucket Data Center",
    "versions": [
      {
        "status": "affected",
        "version": "All other versions"
      },
      {
        "status": "unaffected",
        "version": "Patch version 10.2.8 and later"
      },
      {
        "status": "unaffected",
        "version": "Patch version 10.5.1 and later"
      },
      {
        "status": "unaffected",
        "version": "Patch version 9.4.26 and later"
      }
    ]
  },
  {
    "vendor": "Atlassian",
    "product": "Confluence Data Center",
    "versions": [
      {
        "status": "affected",
        "version": "All other versions"
      },
      {
        "status": "unaffected",
        "version": "Patch version 10.2.19 and later"
      },
      {
        "status": "unaffected",
        "version": "Patch version 9.2.26 and later"
      }
    ]
  },
  {
    "vendor": "Atlassian",
    "product": "Crowd Data Center",
    "versions": [
      {
        "status": "affected",
        "version": "All other versions"
      },
      {
        "status": "unaffected",
        "version": "Patch version 7.2.4 and later"
      },
      {
        "status": "unaffected",
        "version": "Patch version 7.1.7 and later"
      },
      {
        "status": "unaffected",
        "version": "Patch version 7.0.3 and later"
      },
      {
        "status": "unaffected",
        "version": "Patch version 6.3.7 and later"
      }
    ]
  },
  {
    "vendor": "Atlassian",
    "product": "Crucible Data Center",
    "versions": [
      {
        "status": "affected",
        "version": "All other versions"
      },
      {
        "status": "unaffected",
        "version": "Patch version 4.9.15 and later"
      }
    ]
  },
  {
    "vendor": "Atlassian",
    "product": "Fisheye Data Center",
    "versions": [
      {
        "status": "affected",
        "version": "All other versions"
      },
      {
        "status": "unaffected",
        "version": "Patch version 4.9.15 and later"
      }
    ]
  },
  {
    "vendor": "Atlassian",
    "product": "Jira Service Management Data Center",
    "versions": [
      {
        "status": "affected",
        "version": "All other versions"
      },
      {
        "status": "unaffected",
        "version": "Patch version 11.3.12 and later"
      },
      {
        "status": "unaffected",
        "version": "Patch version 10.3.26 and later"
      },
      {
        "status": "unaffected",
        "version": "Patch version 5.12.40 and later"
      }
    ]
  },
  {
    "vendor": "Atlassian",
    "product": "Jira Software Data Center",
    "versions": [
      {
        "status": "affected",
        "version": "All other versions"
      },
      {
        "status": "unaffected",
        "version": "Patch version 11.3.12 and later"
      },
      {
        "status": "unaffected",
        "version": "Patch version 10.3.26 and later"
      },
      {
        "status": "unaffected",
        "version": "Patch version 9.12.40 and later"
      }
    ]
  }
]

Related CVEs: CVE-2026-21589
Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-21589 · Unrated

Multiple Products · Known exploited (CISA KEV)

Event: #39715 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 10:51:16 GMT
Publisher date: Mon, 05 Oct 2026 21:30:00 GMT

Read the original announcement