Vulnerability record · CVE-2026-77258 · published 22 September 2026

CVE-2026-77258: Path traversal vulnerability

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.

7.7 CVSS 3.1 High EPSS 0.33% · top 76.7% CWE-22 · Path traversal Undergoing Analysis

7.7CVSS 3.1 base score

0.33%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

5References

26 Sep 2026Last modified by NVD

Description

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

References

Link	Tags
https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460
https://github.com/sooperset/mcp-atlassian/pull/1448
https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0
https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-93xw-j965-9mx3
https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-93xw-j965-9mx3

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Source: NIST National Vulnerability Database (record CVE-2026-77258), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.