CVE-2026-21589 Atlassian Data Center - Arbitrary File Access

Atlassian Bitbucket, Confluence, Jira Service Management, Jira Software, Bamboo, Crowd, Crucible, and Fisheye Data Center versions contain an arbitrary file access vulnerability caused by improper access control in the web application root directory, letting unauthenticated attackers access specific files with prior knowledge of exact file names and paths, exploit requires prior knowledge of target file path.

CVSS base score 9.3 /10
Critical
CISA KEV
Exploited in the wild
Public exploit
Proof of concept available
Authentication
Not required
EPSS
2.78% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Arbitrary File Access
Impact
Information Disclosure, File System Read
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
Published
5 October 2026
Updated
15 October 2026
Weakness
CWE-552

Vendor fix

Upgrade to fixed versions: Bitbucket 9.4.26, 10.2.8, 10.5.1; Confluence 9.2.26, 10.2.19; Crowd 6.3.7, 7.0.3, 7.1.1, 7.2.4; Jira Software 9.12.40, 10.3.26, 11.3.12; Jira Service Management 5.12.40, 10.3.26, 11.3.12; Bamboo 10.2.24, 12.1.12; Crucible 4.9.15; Fisheye 4.9.15 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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