{"id":"CVE-2026-77260","title":"MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira)","summary":"MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the Confluence and Jira upload_attachment implementations accept an unconstrained file_path and open the referenced ser…","severity":"high","cvss":8.3,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N","cwe":["CWE-22"],"vendor":"sooperset","product":"mcp-atlassian","affected":["mcp-atlassian < 0.22.0"],"patched":["mcp-atlassian 0.22.0"],"published":"2026-09-22","updated":"2026-09-26","sourceUpdated":"2026-09-26T01:17:02.417","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77260","references":[{"url":"https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/pull/1448","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f4p7-qx46-wc5j","label":"security-advisories@github.com"},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-f4p7-qx46-wc5j","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77260"},{"url":"https://github.com/advisories/GHSA-f4p7-qx46-wc5j"},{"url":"https://github.com/sooperset/mcp-atlassian"},{"url":"https://pypi.org/project/mcp-atlassian"}],"tags":["nvd","cve.org","exploit-available","ghsa","pip","osv"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-25T23:58:59.191432Z"},"cvssSource":"cna","epss":0.00385,"epssPercentile":0.32368,"aliases":["GHSA-f4p7-qx46-wc5j","PYSEC-2026-4091"],"ecosystem":"pip","ingestedAt":"2026-09-22T19:09:09.986Z","slug":"CVE-2026-77260","body":"## Overview\n\nMCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the Confluence and Jira upload_attachment implementations accept an unconstrained file_path and open the referenced server-local file. A permitted MCP caller can upload sensitive host files to an Atlassian destination and then retrieve their contents. The advisory traces the vulnerable input and processing flow through upload_attachment, file_path, and CVE-2026-27825, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-77260)\n\nAffected packages:\n\n- `mcp-atlassian < 0.22.0`\n\nPatched in:\n\n- `mcp-atlassian 0.22.0`\n\nSource: https://github.com/advisories/GHSA-f4p7-qx46-wc5j","depth":"midnight","depthScore":58,"depthScoreParts":{"impact":45.7,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":212721,"id":"CVE-2026-77260","ts":1790695474636,"field":"cvss","old":"7.5","new":"8.3"},{"seq":212685,"id":"CVE-2026-77260","ts":1790692638936,"field":"cvss","old":"8.3","new":"7.5"},{"seq":211238,"id":"CVE-2026-77260","ts":1790385910761,"field":"exploit_available","old":"false","new":"true"}]}