CVE-2026-77270
Description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the Jira and Confluence attachment upload tools treat caller-controlled file_path values as trusted server-local paths. The server opens the selected file and uploads it to an Atlassian issue or page, allowing an MCP caller with upload access to disclose any file readable by the server process. The advisory traces the vulnerable input and processing flow through confluence_upload_attachment, jira_upload_attachment, file_path, and open(file_path, "rb"), which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
mcp-atlassianPyPI | < 0.22.0 | 0.22.0 |
Affected products
2- Range: <0.22.0
Patches
Vulnerability mechanics
References
6- github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460nvdPatchWEB
- github.com/sooperset/mcp-atlassian/pull/1448nvdIssue TrackingPatchWEB
- github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f26r-j276-ggg4nvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-f26r-j276-ggg4ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-77270ghsaADVISORY
- github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0nvdRelease NotesWEB
News mentions
1- Atlassian MCP: 25 Coordinated Vulnerabilities Expose Jira, Confluence IntegrationsVypr Intelligence · Sep 22, 2026