Critical [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
This critical-severity Atlassian advisory covers CVE-2026-21589 affecting Bamboo Data Center, Bitbucket Data Center, Confluence Data Center.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
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.
Affected products named by the advisory: Crucible Data Center; Fisheye Data Center.
CISA Known Exploited Vulnerability
- Listed:
- Oct 15, 2026 · federal remediation due Oct 18, 2026
- 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.
KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.
- Bamboo Data Center All other versions
- Bitbucket Data Center All other versions
- Confluence Data Center All other versions
- Crowd Data Center All other versions
- Crucible Data Center All other versions
- Fisheye Data Center All other versions
- Jira Service Management Data Center All other versions
- Jira Software Data Center All other versions
Official advisory · high-confidence parse· fetched 16 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 16 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 16 days ago·verify at source
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