Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability
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 knowledg
What happened
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 lists it as exploited, added 15 Oct 2026.
Does it affect you
Names Atlassian Confluence. Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Follow the vendor advisory for the fixed release and any interim mitigation.
jira.atlassian.com - Follow the vendor advisory for the fixed release and any interim mitigation.
jira.atlassian.com - Follow the vendor advisory for the fixed release and any interim mitigation.
jira.atlassian.com - Follow the vendor advisory for the fixed release and any interim mitigation.
jira.atlassian.com - 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.
cisa.gov
CISA’s notes for this entry:
- confluence.atlassian.com/security/cve-2026-21589-arbitrary-file-access-vulnerability-impacts-multiple-products-1870495748.html?ref=labs.watchtowr.com
- BOD 26-04: cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- Forensics Triage Requirements: cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- nvd.nist.gov/vuln/detail/CVE-2026-21589
Affected, as published to NVD
- confluence
- Atlassian Confluence: 5.10.0 up to the fix in 9.2.26
The record
- NVD status
- Analyzed
- Published
- 05 Oct 2026, last modified 19 Oct 2026 (NVD)
- Severity
- CVSS 3.1 base score 7.5, High — computed here from the vector; NVD states 7.5.
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness
- CWE-552 Files or Directories Accessible to External Parties (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 15 Oct 2026; federal remediation due 18 Oct 2026. CISA entry
- Exploit probability
- EPSS 12.7%, 96th percentile — FIRST, scored 23 Oct 2026. FIRST EPSS
- Vendor
- Atlassian · Multiple Products (CISA)
References on the NVD record
- jira.atlassian.com/browse/BAM-26567Issue TrackingMitigationVendor Advisory
- jira.atlassian.com/browse/BSERV-20604Issue TrackingMitigationVendor Advisory
- jira.atlassian.com/browse/CONFSERVER-104488Issue TrackingMitigationVendor Advisory
- jira.atlassian.com/browse/CRUC-8741Issue TrackingMitigationVendor Advisory
- jira.atlassian.com/browse/CWD-6610Issue TrackingMitigationVendor Advisory
- jira.atlassian.com/browse/FE-7583Issue TrackingMitigationVendor Advisory
- jira.atlassian.com/browse/JRASERVER-79546Issue TrackingMitigationVendor Advisory
- jira.atlassian.com/browse/JSDSERVER-16809Issue TrackingMitigationVendor Advisory
- github.com/watchtowrlabs/watchTowr-vs-Atlassian-CVE-2026-21589Third Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21589US Government Resource
Reporting that names this identifier
- CISA Adds One Known Exploited Vulnerability to Catalog — CISA, 10 d ago
- Attackers Target Critical Atlassian Vulnerability Within Hours of PoC Publication — SecurityWeek, 17 d ago
- Exploitation attempts against critical Atlassian flaw have begun (CVE-2026-21589) — Help Net Security, 17 d ago
- Hackers exploit critical Atlassian flaw after public PoC release — BleepingComputer, 18 d ago
- Atlassian Data Center Flaw Draws Exploitation Attempts Within Two Hours of Public Details — The Hacker News, 18 d ago
- Atlassian warns of critical file-access flaw in Jira, Confluence — BleepingComputer, 18 d ago
- Atlassian urges immediate patching of critical Data Center file access vulnerability (CVE-2026-21589) — Help Net Security, 19 d ago
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.