Atlassian has released a critical security advisory highlighting major vulnerabilities in products like Confluence, Jira, Bitbucket, and Bamboo Data Center and Server editions. These flaws, discovered via bug bounties and external research, include remote code execution, privilege escalation, denial of service, and issues caused by third-party libraries. Exploitation could allow attackers to create admin accounts, crash services, or leak data. Atlassian urges users to upgrade immediately to patched versions, follow security best practices, and monitor official advisories. Cloud-hosted products remain unaffected by these issues. Immediate action is recommended to protect systems and data.