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CVE-2026-21589CISA KEV

Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability

CISA lists this Atlassian Multiple Products vulnerability as known exploited. Check the cited references and original publisher guidance for affected products and remediation.

CISA KEVCISA-cited referenceNVD

CISA catalog record

Multiple Atlassian products (Bitbucket Data Center ,Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible and Fisheye) contain a files or directories accessible to external parties vulnerability which could allow an unauthenticated attacker to access specific files within the web application root directory in affected versions.

Product
Multiple Products
Added to KEV
15 Oct 2026
Federal remediation due
18 Oct 2026
Known ransomware use
Not reported
Public detection template
PublicNuclei template · template membership does not establish exploit availability or applicability to your systems.

What changed

  1. Detection template: Nuclei template listed
  2. Detection template: Nuclei template listed
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (16)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 6 Nov 2026 · 17:32:22 UTC Source coverage: public-exploit-codeCurrent
  2. 6 Nov 2026 · 17:32:22 UTC Link: Nuclei templatehttps://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml
  3. 6 Nov 2026 · 16:31:02 UTC Source coverage: public-exploit-codeCurrent → Not collected
  4. 6 Nov 2026 · 16:31:02 UTC Link: Nuclei templatehttps://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml → No longer listed in this observation
  5. 2 Nov 2026 · 17:30:39 UTC Source coverage: public-exploit-codeCurrent
  6. 2 Nov 2026 · 17:30:39 UTC Link: Nuclei templatehttps://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml
  7. 2 Nov 2026 · 16:27:39 UTC Source coverage: public-exploit-codeCurrent → Not collected
  8. 2 Nov 2026 · 16:27:39 UTC Link: Nuclei templatehttps://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml → No longer listed in this observation
  9. 29 Oct 2026 · 20:19:26 UTC Public detection templateNuclei template listed
  10. 29 Oct 2026 · 20:19:26 UTC Link: Vendor advisoryhttps://confluence.atlassian.com/security/cve-2026-21589-arbitrary-file-access-vulnerability-impacts-multiple-products-1870495748.html?ref=labs.watchtowr.com → No longer listed in this observation
  11. 29 Oct 2026 · 20:19:26 UTC Link: CISA-cited referencehttps://confluence.atlassian.com/security/cve-2026-21589-arbitrary-file-access-vulnerability-impacts-multiple-products-1870495748.html?ref=labs.watchtowr.com
  12. 28 Oct 2026 · 05:10:29 UTC Public exploit codeNuclei template listed
  13. 28 Oct 2026 · 05:10:29 UTC Source coverage: public-exploit-codeCurrent
  14. 28 Oct 2026 · 05:10:29 UTC Link: Nuclei templatehttps://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml
  15. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  16. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete

Explore global source statements, affected packages and advisory history for CVE-2026-21589. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-21589

Published

Bamboo Data Center

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Atlassian",
                    "product": "Bamboo Data Center",
                    "versions": [
                        {
                            "version": "All other versions",
                            "status": "affected"
                        },
                        {
                            "version": "Patch version 10.2.24 and later",
                            "status": "unaffected"
                        },
                        {
                            "version": "Patch version 12.1.12 and later",
                            "status": "unaffected"
                        }
                    ]
                }

Bitbucket Data Center

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Atlassian",
                    "product": "Bitbucket Data Center",
                    "versions": [
                        {
                            "version": "All other versions",
                            "status": "affected"
                        },
                        {
                            "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",
                            "status": "unaffected"
                        }
                    ]
                }

Confluence Data Center

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Atlassian",
                    "product": "Confluence Data Center",
                    "versions": [
                        {
                            "version": "All other versions",
                            "status": "affected"
                        },
                        {
                            "version": "Patch version 10.2.19 and later",
                            "status": "unaffected"
                        },
                        {
                            "version": "Patch version 9.2.26 and later",
                            "status": "unaffected"
                        }
                    ]
                }

Crowd Data Center

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Atlassian",
                    "product": "Crowd Data Center",
                    "versions": [
                        {
                            "version": "All other versions",
                            "status": "affected"
                        },
                        {
                            "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",
                            "status": "unaffected"
                        }
                    ]
                }

Crucible Data Center

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Atlassian",
                    "product": "Crucible Data Center",
                    "versions": [
                        {
                            "version": "All other versions",
                            "status": "affected"
                        },
                        {
                            "version": "Patch version 4.9.15 and later",
                            "status": "unaffected"
                        }
                    ]
                }

Fisheye Data Center

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Atlassian",
                    "product": "Fisheye Data Center",
                    "versions": [
                        {
                            "version": "All other versions",
                            "status": "affected"
                        },
                        {
                            "version": "Patch version 4.9.15 and later",
                            "status": "unaffected"
                        }
                    ]
                }

Jira Service Management Data Center

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Atlassian",
                    "product": "Jira Service Management Data Center",
                    "versions": [
                        {
                            "version": "All other versions",
                            "status": "affected"
                        },
                        {
                            "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",
                            "status": "unaffected"
                        }
                    ]
                }

Jira Software Data Center

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Atlassian",
                    "product": "Jira Software Data Center",
                    "versions": [
                        {
                            "version": "All other versions",
                            "status": "affected"
                        },
                        {
                            "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",
                            "status": "unaffected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 7 Nov 08:57 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current

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