vulnerability

CVE-2026-77258

NVD HIGH 7.7 · published 2026-09-22 · 1 on the wire

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, upload_attachment in src/mcp_atlassian/confluence/attachments.py accepts a caller-controlled file_path and opens the selected server-local file without restricting it to the workspace. A permitted Confluence MCP caller can upload the file as an attachment and disclose data readable by the server process. This issue is fixed in version 0.22.0.

Exploited in the wild

Not on KEV

Not in CISA's Known Exploited Vulnerabilities catalogue as of the last daily pull. Absence is not proof of safety.

EPSS · 30-day forecast

Chance of exploitation in the next 30 days, 41th percentile of all CVEs. A forecast; KEV outranks it.

CVSS · NVD

7.7

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Internet exposure

—

No exposure census on this CVE's dispatches.

On the wire1

23 SepGHSA-93xw-j965-9mx3: MCP Atlassian: Arbitrary file read/exfiltration via upload_attachment missing validate_safe_path()VULN

References

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