CVE-2026-21589KEV · OVERDUECWE-552

Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability

High · published October 6, 2026

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 7.5. It is confirmed in active exploitation. It sits in the 96.3th percentile for exploit probability.

6
days past CISA
deadline
CVSS v3.1
7.5
EPSS
13%
Percentile
96.3
In the wild
Confirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
9.3 · 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
EPSS
0.12711 · 96.3th percentile
Weakness
CWE-552 · Files or Directories Accessible to External Parties
Published
2026-10-06T02:16Z
KEV added
2026-10-15 · due 2026-10-18
Affected products (21)
ProductVersionsFixed in
atlassian/bitbucket_data_center≥ 7.17.0, < 9.4.269.4.26
atlassian/bitbucket_data_center≥ 9.5.0, < 10.2.810.2.8
atlassian/bitbucket_data_center≥ 10.3.0, < 10.5.110.5.1
atlassian/bitbucket_server≥ 4.6.0, ≤ 8.14.6—
atlassian/confluence_data_center≥ 5.10.0, < 9.2.269.2.26
atlassian/confluence_data_center≥ 9.3.0, < 10.2.1910.2.19
atlassian/crowd≥ 2.11.0, < 6.3.76.3.7
atlassian/crowd≥ 7.0.0, < 7.0.37.0.3
atlassian/crowd≥ 7.1.0, < 7.1.77.1.7
atlassian/crowd≥ 7.2.0, < 7.2.47.2.4
atlassian/jira_data_center≥ 7.1.0, < 9.12.409.12.40
atlassian/jira_data_center≥ 9.13.0, < 10.3.2610.3.26
atlassian/jira_data_center≥ 10.4.0, < 11.3.1211.3.12
atlassian/jira_service_desk≥ 3.1.0, ≤ 4.13.27—
atlassian/jira_service_management≥ 4.14.0, < 5.12.405.12.40
atlassian/jira_service_management≥ 5.13.0, < 10.3.2610.3.26
atlassian/jira_service_management≥ 10.4.0, < 11.3.1211.3.12
atlassian/bamboo≥ 7.0.1, < 10.2.2410.2.24
atlassian/bamboo≥ 11.0.0, < 12.1.1212.1.12
atlassian/crucible< 4.9.154.9.15
atlassian/fisheye< 4.9.154.9.15
References (10)
EPSS history
Timeline
  • 15 OCT 00:00Z
    Added to CISA KEV — remediate by Oct 18
    kev
  • 07 OCT 03:40Z
    EPSS moved — → 1%
    epss
  • 05 OCT 21:30Z
    h3
    cvelistv5