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CVE-2026-77266

mcp-atlassian · path traversal

CVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-77266

Published

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, upload_attachment accepts absolute paths and traversal sequences without constraining the resolved path to the server workspace. An MCP caller with attachment access can read a chosen server-local file and exfiltrate it through Jira or Confluence. The advisory traces the vulnerable input and processing flow through upload_attachment, file_path, and path traversal, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

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Affected versions, risk and source history

Exploitation and risk

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Advisory history

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23 Oct 2026 15:48:27 UTC

MCP Atlassian: Path traversal in upload_attachment allows arbitrary file read and exfiltration via MCP tool call

cve-program · CVE-2026-77266 · Published

ChangeIntel

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Sources read 13 Nov 10:02 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current

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