CVE-2026-21589: Software Security Vulnerability Vulnerability
CRITICALCVE-2026-21589 is a CRITICAL (CVSS 7.5) security vulnerability vulnerability (CWE-552: Files or Directories Accessible to External Parties) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product makes files or directories accessible to unauthorized actors, even though they should not be.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-21589 at a Glance
Security Impact
CVSS: 7.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
How to Fix CVE-2026-21589
To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:treeHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-21589, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:treeAnalyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.
Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-552: Files or Directories Accessible to External Parties, where the product makes files or directories accessible to unauthorized actors, even though they should not be. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
References
Frequently Asked Questions
What is CVE-2026-21589?
Which Software versions are affected?
What version fixes CVE-2026-21589?
What is the CVSS score of CVE-2026-21589?
What CWE is associated with CVE-2026-21589?
How can I check Maven dependencies for CVE-2026-21589?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-gr66-x5pq-8g2g",
"modified" : "2026-10-19T21:35:53Z",
"published" : "2026-10-06T00:32:50Z",
"aliases" : [ "CVE-2026-21589" ],
"details" : "h3. Summary\n\nThis 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. \n\nh3. Context\n\nThis vulnerability allows an unauthenticated remote attacker to access specific files within the web application root directory in affected versions.\n\nh3. Details:\n\n* The vulnerability must be addressed for affected versions of:\n Bitbucket Data Center, introduced in version >= 4.6.0, fix versions: 9.4.26, 10.2.8, 10.5.1\n Confluence Data Center, introduced in version >= 5.10.0, fix versions 9.2.26, 10.2.19\n Crowd Data Center, introduced in version >= 2.11.0, fix versions 6.3.7, 7.0.3, 7.1.1, 7.2.4\n Jira Software Data Center, introduced in version >= 7.1.0, fix versions 9.12.40, 10.3.26, 11.3.12\n Jira Service Management Data Center, introduced in version >= 3.1.0, fix versions 5.12.40, 10.3.26, 11.3.12\n Bamboo Data Center >= 7.0.1, fix versions 10.2.24, 12.1.12\n Crucible, fix versions 4.9.15\n Fisheye, fix version 4.9.15\n* Exploitation requires prior knowledge of the target file's exact name and path.\n* The vulnerability does not include the capability to enumerate or list directory contents.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
}, {
"type" : "CVSS_V4",
"score" : "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"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-21589"
}, {
"type" : "WEB",
"url" : "https://github.com/watchtowrlabs/watchTowr-vs-Atlassian-CVE-2026-21589"
}, {
"type" : "WEB",
"url" : "https://jira.atlassian.com/browse/BAM-26567"
}, {
"type" : "WEB",
"url" : "https://jira.atlassian.com/browse/BSERV-20604"
}, {
"type" : "WEB",
"url" : "https://jira.atlassian.com/browse/CONFSERVER-104488"
}, {
"type" : "WEB",
"url" : "https://jira.atlassian.com/browse/CRUC-8741"
}, {
"type" : "WEB",
"url" : "https://jira.atlassian.com/browse/CWD-6610"
}, {
"type" : "WEB",
"url" : "https://jira.atlassian.com/browse/FE-7583"
}, {
"type" : "WEB",
"url" : "https://jira.atlassian.com/browse/JRASERVER-79546"
}, {
"type" : "WEB",
"url" : "https://jira.atlassian.com/browse/JSDSERVER-16809"
}, {
"type" : "WEB",
"url" : "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21589"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-552" ],
"severity" : "CRITICAL",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-10-05T22:16:58Z"
}
}