CVE-2026-77246

7.4 HIGHpublic exploit available

Published 2026-09-22 · Updated 2026-09-28

AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.

NVD description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, an HTTP transport deployment with READ_ONLY_MODE=false accepts a request without an Authorization identity and permits attacker-controlled Atlassian service headers, including X-Atlassian-Confluence-Url, to select a public attacker hostname or one allowed by MCP_ALLOWED_URL_DOMAINS. A caller can then invoke confluence_upload_attachment or the Jira attachment variant in src/mcp_atlassian/jira/attachments.py with a server-local file_path and cause the MCP process to send the file to the selected attachment endpoint. This issue is fixed in version 0.22.0.

CVSS vector

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

Weaknesses

CWE-22, CWE-200, CWE-441

Vendors

mcp-atlassian

Products

mcp atlassian

Public exploit & PoC references

https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460[Patch]
https://github.com/sooperset/mcp-atlassian/pull/1448[Issue Tracking, Patch]
https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0[Release Notes]
https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-wv8v-v4c5-v75j[Exploit, Vendor Advisory]
https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-wv8v-v4c5-v75j[Exploit, Vendor Advisory]

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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