Crucible

Atlassian Fixes Critical Path Traversal Flaw CVE-2026-21589 Exposing Files in Jira and Confluence

Atlassian has patched CVE-2026-21589, a CVSS 9.3 path traversal vulnerability that allows unauthenticated attackers to read files across eight products including Bitbucket, Confluence, Jira Software, Jira Service Management, Bamboo, Crowd, Crucible and Fisheye in Data Center editions. The flaw accepts manipulated paths where traversal sequences appear adjacent to forward slashes, backslashes or double colons, including URL-encoded variants. Attackers must know the exact file name and path because the vulnerability does not permit directory listing and is restricted to the web application root directory of each product. Configuration files located in predictable locations remain accessible to attackers familiar with the products. Patches have been released in specific versions such as Bitbucket 10.5.1, Confluence 10.2.19, Jira Software and Jira Service Management 11.3.12, Bamboo 12.1.12, Crowd 7.2.4 and Crucible and Fisheye 4.9.15. Atlassian found no evidence of exploitation in its cloud products, though the advisory does not address on-premises customer installations.