CVE-2026-21589
This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center.
- Severity: Critical
- CVSS 9.3
- EPSS 12.71%
- On CISA KEV
- Weaponized (Metasploit/Nuclei)
- P1 · Patch now
Why P1: on CISA KEV.
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 Known Exploited Vulnerability
Added 2026-10-15, remediation due 2026-10-18. Ransomware use: Unknown. 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…
Affected products
- atlassian bamboo >= 11.0.0, < 12.1.12
- atlassian bamboo >= 7.0.1, < 10.2.24
- atlassian bitbucket data center >= 10.3.0, < 10.5.1
- atlassian bitbucket data center >= 7.17.0, < 9.4.26
- atlassian bitbucket data center >= 9.5.0, < 10.2.8
- atlassian bitbucket server >= 4.6.0, <= 8.14.6
- atlassian confluence data center >= 5.10.0, < 9.2.26
- atlassian confluence data center >= 9.3.0, < 10.2.19
- atlassian crowd >= 2.11.0, < 6.3.7
- atlassian crowd >= 7.0.0, < 7.0.3
- atlassian crowd >= 7.1.0, < 7.1.7
- atlassian crowd >= 7.2.0, < 7.2.4
- atlassian crucible < 4.9.15
- atlassian fisheye < 4.9.15
- atlassian jira data center >= 10.4.0, < 11.3.12
- atlassian jira data center >= 7.1.0, < 9.12.40
- atlassian jira data center >= 9.13.0, < 10.3.26
- atlassian jira service desk >= 3.1.0, <= 4.13.27
- atlassian jira service management >= 10.4.0, < 11.3.12
- atlassian jira service management >= 4.14.0, < 5.12.40
Weakness
CVSS vector
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
References
- NVD record NVD
- CVE Program record CVE Program
- Reference NVD
- Reference NVD
- Reference NVD
- Reference NVD
- Reference NVD
- Reference NVD
- Reference NVD
- Reference NVD
- Reference NVD
- Reference NVD
- GitHub security advisory GitHub
- CISA KEV catalog CISA