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CVE-2026-21589

Files or Directories Accessible to External Parties

CVSS 4.0 Critical 9.3Known exploited (CISA KEV)

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

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.

Official description from the CVE record, published by atlassian. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 4.0 Critical 9.3
Score published by atlassian in the CVE record.

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

  • Attack vector: Network

    The vulnerable component can be reached over a network, possibly from the Internet.

  • Attack complexity: Low

    No measurable action is needed to get around the system's built-in security controls. The attack is repeatable.

  • Attack requirements: None

    The attack works without any special deployment or execution conditions.

  • Privileges required: None

    No account or privileges are needed.

  • User interaction: None

    No action from any user is needed.

  • Vulnerable system: confidentiality: High

    Serious or total effect on the secrecy of data.

  • Vulnerable system: integrity: None

    No effect on the trustworthiness of data.

  • Vulnerable system: availability: None

    No effect on availability.

  • Subsequent systems: confidentiality: High

    Serious or total effect on other systems' data secrecy.

  • Subsequent systems: integrity: High

    Serious or total effect on other systems' data trustworthiness.

  • Subsequent systems: availability: High

    Serious or total effect on other systems' availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS
Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.99664 (99.7% probability)
Percentile
99.9%
Scores of
Nov 10, 2026
Model
v2026.06.15
CISA Known Exploited Vulnerabilities
This CVE is listed in the CISA KEV catalog.
Name in the catalog
Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability
Added to the catalog
Oct 15, 2026
Federal due date
Oct 18, 2026
CISA assessment as of Oct 16, 2026
Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
no
Technical impact
total
Weakness (CWE)
CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-552Files or Directories Accessible to External Parties
Affected products
Products listed in the CVE record, as the CNA published them.

  • Atlassian Bamboo Data Center

    • affected: All other versions
    • unaffected: Patch version 10.2.24 and later
    • unaffected: Patch version 12.1.12 and later

  • Atlassian Bitbucket Data Center

    • affected: All other versions
    • unaffected: Patch version 10.2.8 and later
    • unaffected: Patch version 10.5.1 and later
    • unaffected: Patch version 9.4.26 and later

  • Atlassian Confluence Data Center

    • affected: All other versions
    • unaffected: Patch version 10.2.19 and later
    • unaffected: Patch version 9.2.26 and later

  • Atlassian Crowd Data Center

    • affected: All other versions
    • unaffected: Patch version 7.2.4 and later
    • unaffected: Patch version 7.1.7 and later
    • unaffected: Patch version 7.0.3 and later
    • unaffected: Patch version 6.3.7 and later

  • Atlassian Crucible Data Center

    • affected: All other versions
    • unaffected: Patch version 4.9.15 and later

  • Atlassian Fisheye Data Center

    • affected: All other versions
    • unaffected: Patch version 4.9.15 and later

  • Atlassian Jira Service Management Data Center

    • affected: All other versions
    • unaffected: Patch version 11.3.12 and later
    • unaffected: Patch version 10.3.26 and later
    • unaffected: Patch version 5.12.40 and later

  • Atlassian Jira Software Data Center

    • affected: All other versions
    • unaffected: Patch version 11.3.12 and later
    • unaffected: Patch version 10.3.26 and later
    • unaffected: Patch version 9.12.40 and later
References
Links listed in the CVE record. They lead to other sites, which CubePath does not control.
Timeline
  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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About CubePath
CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.
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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:06 UTC. Sources and licenses