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Atlassian Multiple Products Exposed Files Vulnerability

CVE-2026-21589

What this means

This is rated critical severity (9.3 out of 10). It is on the known-exploited catalogue, which means attacks using it have already been seen. Ask IT whether Atlassian Bitbucket Data Center, Atlassian Bitbucket Server and Atlassian Confluence Data Center, and 7 more are in your estate, and treat that as the priority.

Full vendor description

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 file's exact name and path. The vulnerability does not include the capability to enumerate or list directory contents.

Scoring and exploitation

9.3/ 10
CVSS 4.0 base scoreCritical

Exploitable over the network without any account, and no one has to click or open anything. High impact on confidentiality, subsequent confidentiality, subsequent integrity and subsequent availability.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploitability

Longer bar: easier to attack

Attack vectorNetworkAV:N
Attack complexityLowAC:L
Attack requirementsNoneAT:N
Privileges requiredNonePR:N
User interactionNoneUI:N

Impact

Longer bar: more harm

ConfidentialityHighVC:H
IntegrityNoneVI:N
AvailabilityNoneVA:N
Subsequent confidentialityHighSC:H
Subsequent integrityHighSI:H
Subsequent availabilityHighSA:H
Elevated attack likelihood (~99.7% in 30 days)Model estimate (): a probability signal, not confirmed exploitation
Exploited in the wild
Yes — confirmed exploitation (US CISA )
Not reported
Listed product
Atlassian Multiple Products

Weaknesses

CWE-552

Affected products ()

  • Atlassian Bitbucket Data Center
  • Atlassian Bitbucket Server
  • Atlassian Confluence Data Center
  • Atlassian Crowd
  • Atlassian Jira Data Center
  • Atlassian Jira Service Desk
  • Atlassian Jira Service Management
  • Atlassian Bamboo
  • Atlassian Crucible
  • Atlassian Fisheye
Show the raw CPE strings (10)
  • cpe:2.3:a:atlassian:bitbucket_data_center:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:bitbucket_server:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:jira_service_desk:*:*:*:*:data_center:*:*:*
  • cpe:2.3:a:atlassian:jira_service_management:*:*:*:*:data_center:*:*:*
  • cpe:2.3:a:atlassian:bamboo:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:crucible:*:*:*:*:*:*:*:*
  • cpe:2.3:a:atlassian:fisheye:*:*:*:*:*:*:*:*

References

10 links from the CVE record, grouped by site; the vendor's advisory comes first.