PyPI/mcp-atlassian CVE-2026-77259: high 7.7, EPSS 0.41%

MCP Atlassian: Arbitrary file read via confluence_upload_attachment allows exfiltration of server credentials

Action: Upgrade mcp-atlassian to 0.22.0 or later.

pip install mcp-atlassian==0.22.0

Affected

Fixed versions

Sources

• osv: PYSEC-2026-4086
• https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6cr4-ccf3-x7h4
• https://github.com/sooperset/mcp-atlassian/pull/1448
• https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460
• https://github.com/sooperset/mcp-atlassian
• https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0
• https://pypi.org/project/mcp-atlassian
• https://github.com/advisories/GHSA-6cr4-ccf3-x7h4
• https://nvd.nist.gov/vuln/detail/CVE-2026-77259

CVE-2026-77259 · published 2026-10-01T16:38:35.781045Z · modified 2026-10-01T17:45:11.764906241Z · JSON