CVE-2026-21589
KEV: known exploited SSVC: activeCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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
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 conditions and impact
Derived from the NVD CVSS 3.1 vectorThis vulnerability may be exploitable over the internet without authentication or user interaction.
| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | N | None |
| User interaction UI | N | None |
| Scope S | U | Unchanged |
| Confidentiality C | H | High |
| Integrity I | N | None |
| Availability A | N | None |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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.
CISA KEV entry
Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability — Atlassian / Multiple Products
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.
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
https://confluence.atlassian.com/security/cve-2026-21589-arbitrary-file-access-vulnerability-impacts-multiple-products-1870495748.html?ref=labs.watchtowr.com ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-21589
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / [email protected] (Secondary) | 4.0 | 9.3 CRITICAL | 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 |
| NVD / [email protected] (Primary) | 3.1 | 7.5 HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| CNA / atlassian | 4.0 | 9.3 CRITICAL | 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 |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| 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 |
NVD CPE (21)
Show CPE list
| Vendor | Product | Range | CPE |
|---|---|---|---|
| atlassian | bitbucket_data_center | >= 7.17.0, < 9.4.26 | cpe:2.3:a:atlassian:bitbucket_data_center:*:*:*:*:*:*:*:* |
| atlassian | bitbucket_data_center | >= 9.5.0, < 10.2.8 | cpe:2.3:a:atlassian:bitbucket_data_center:*:*:*:*:*:*:*:* |
| atlassian | bitbucket_data_center | >= 10.3.0, < 10.5.1 | cpe:2.3:a:atlassian:bitbucket_data_center:*:*:*:*:*:*:*:* |
| atlassian | bitbucket_server | >= 4.6.0, <= 8.14.6 | cpe:2.3:a:atlassian:bitbucket_server:*:*:*:*:*:*:*:* |
| atlassian | confluence_data_center | >= 5.10.0, < 9.2.26 | cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:* |
| atlassian | confluence_data_center | >= 9.3.0, < 10.2.19 | cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:* |
| atlassian | crowd | >= 2.11.0, < 6.3.7 | cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:* |
| atlassian | crowd | >= 7.0.0, < 7.0.3 | cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:* |
| atlassian | crowd | >= 7.1.0, < 7.1.7 | cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:* |
| atlassian | crowd | >= 7.2.0, < 7.2.4 | cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:* |
| atlassian | jira_data_center | >= 7.1.0, < 9.12.40 | cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:* |
| atlassian | jira_data_center | >= 9.13.0, < 10.3.26 | cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:* |
| atlassian | jira_data_center | >= 10.4.0, < 11.3.12 | cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:* |
| atlassian | jira_service_desk | >= 3.1.0, <= 4.13.27 | cpe:2.3:a:atlassian:jira_service_desk:*:*:*:*:data_center:*:*:* |
| atlassian | jira_service_management | >= 4.14.0, < 5.12.40 | cpe:2.3:a:atlassian:jira_service_management:*:*:*:*:data_center:*:*:* |
| atlassian | jira_service_management | >= 5.13.0, < 10.3.26 | cpe:2.3:a:atlassian:jira_service_management:*:*:*:*:data_center:*:*:* |
| atlassian | jira_service_management | >= 10.4.0, < 11.3.12 | cpe:2.3:a:atlassian:jira_service_management:*:*:*:*:data_center:*:*:* |
| atlassian | bamboo | >= 7.0.1, < 10.2.24 | cpe:2.3:a:atlassian:bamboo:*:*:*:*:*:*:*:* |
| atlassian | bamboo | >= 11.0.0, < 12.1.12 | cpe:2.3:a:atlassian:bamboo:*:*:*:*:*:*:*:* |
| atlassian | crucible | < 4.9.15 | cpe:2.3:a:atlassian:crucible:*:*:*:*:*:*:*:* |
| atlassian | fisheye | < 4.9.15 | cpe:2.3:a:atlassian:fisheye:*:*:*:*:*:*:*:* |
Linux distribution status
References (10)
- https://github.com/watchtowrlabs/watchTowr-vs-Atlassian-CVE-2026-21589 NVD, ADP CISA-ADP Third Party Advisoryexploit
- https://jira.atlassian.com/browse/BAM-26567 NVD, CNA Issue TrackingMitigationVendor Advisory
- https://jira.atlassian.com/browse/BSERV-20604 NVD, CNA Issue TrackingMitigationVendor Advisory
- https://jira.atlassian.com/browse/CONFSERVER-104488 NVD, CNA Issue TrackingMitigationVendor Advisory
- https://jira.atlassian.com/browse/CRUC-8741 NVD, CNA Issue TrackingMitigationVendor Advisory
- https://jira.atlassian.com/browse/CWD-6610 NVD, CNA Issue TrackingMitigationVendor Advisory
- https://jira.atlassian.com/browse/FE-7583 NVD, CNA Issue TrackingMitigationVendor Advisory
- https://jira.atlassian.com/browse/JRASERVER-79546 NVD, CNA Issue TrackingMitigationVendor Advisory
- https://jira.atlassian.com/browse/JSDSERVER-16809 NVD, CNA Issue TrackingMitigationVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21589 NVD, ADP CISA-ADP US Government Resourcegovernment-resource