CVE-2026-77251 sooperset CVE debrief

Who should care

Defenders of Jira and Confluence deployments should assess exposure, especially where operator credentials have broader access. They should verify if MCP Atlassian versions prior to 0.22.0 are in use and apply the fix to prevent exposure of issues, boards, or pages. Security teams and vulnerability management teams should prioritize verifying exposure and applying the fix.

Why it matters

CVE-2026-77251 allows exposure of sensitive information in Jira and Confluence deployments. Defenders should verify exposure, assess version usage, and apply fixes.

• Verify exposure in Jira and Confluence deployments
• Assess if MCP Atlassian versions prior to 0.22.0 are in use
• Apply the fix to prevent exposure of issues, boards, or pages

Technical summary

The MCP Atlassian server has vulnerabilities in Jira search, Confluence search, and Jira board APIs. These allow exposure of issues, boards, or pages outside JIRA_PROJECTS_FILTER or CONFLUENCE_SPACES_FILTER. The issue is fixed in version 0.22.0. Defenders should assess the impact of these vulnerabilities on their deployments, especially where operator credentials have broader access. The advisory provides details on the vulnerable input and processing flow through jira_search, confluence_search, get_board_issues, get_agile_boards, JIRA_PROJECTS_FILTER, and CONFLUENCE_SPACES_FILTER.

Defensive priority

Defenders should prioritize verifying exposure in Jira and Confluence deployments, especially where operator credentials have broader access. They should assess if MCP Atlassian versions prior to 0.22.0 are in use and apply the fix.

Recommended defensive actions

• Verify MCP Atlassian version and apply fix if necessary
• Assess exposure in Jira and Confluence deployments
• Review operator credentials and access controls
• Perform vulnerability scanning to identify exposed assets
• Implement monitoring to detect potential exploitation attempts
• Review change management processes for patch deployment
• Conduct a thorough review of system logs for signs of compromise

Evidence notes

The advisory provides details on the vulnerable input and processing flow through jira_search, confluence_search, get_board_issues, get_agile_boards, JIRA_PROJECTS_FILTER, and CONFLUENCE_SPACES_FILTER. It identifies the affected entry points, controls, and code paths.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.