CISA-confirmed known exploited vulnerability

CVE-2021-26086

Atlassian Jira Server and Data Center Path Traversal Vulnerability

Atlassian · Jira Server and Data Center

Vulnerability details

Atlassian Jira Server and Data Center contain a path traversal vulnerability that allows a remote attacker to read particular files in the /WEB-INF/web.xml endpoint.

Added to CISA KEV: 2024-11-12

Ransomware campaign use: Unknown

CISA due date: 2024-12-03

Defensive guidance from CISA

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.

Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC

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