Confluence

Atlassian October Security Bulletin Flags 176 Third-Party Library Vulnerabilities Across Jira, Confluence and Bitbucket

Atlassian released its October security bulletin detailing 176 vulnerability entries distributed across seven products including Jira, Confluence, Bamboo, Bitbucket, Crowd, Fisheye and Crucible. Of these, 162 entries carry high severity and 14 are rated critical, though the total does not represent 176 unique flaws because the same identifiers recur when multiple products share the same third-party library. All critical issues originate in external components rather than Atlassian code, with the most severe being CVE-2026-65637 in the Coyote component of Apache Tomcat used by Confluence, which allows interception of server-client connections. Affected versions and corresponding fixes were published for Confluence Data Center, Bamboo, Bitbucket Data Center, Jira Software and Jira Service Management, with the company stressing that administrators must compare exact build numbers against the full corrected-version table. No exploitation of the listed issues had been reported as of 22 October, and Atlassian classifies the inherited exposure from third-party libraries as lower priority, issuing separate critical alerts only for immediate-risk cases.

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.