{"id":"CVE-2026-77271","published":"2026-09-22T18:17:19.107","lastModified":"2026-09-28T13:45:34.133","description":"MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_safe_path defaults its base directory to os.getcwd(), and affected Confluence attachment call sites omit base_dir, allowing attacker-selected writes within the working directory. This Python module overwrite can provide code execution when the application later imports the modified module, bypassing the remediation tracked as CVE-2026-27825. This issue is fixed in version 0.22.0.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-22","CWE-94"],"vendors":["mcp-atlassian"],"products":["mcp atlassian"],"references":[{"url":"https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460","tags":["Patch"]},{"url":"https://github.com/sooperset/mcp-atlassian/pull/1448","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0","tags":["Release Notes"]},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6vmq-24h2-pj7j","tags":["Exploit","Vendor Advisory"]},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6vmq-24h2-pj7j","tags":["Exploit","Vendor Advisory"]}],"exploitRefs":[{"url":"https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460","tags":["Patch"]},{"url":"https://github.com/sooperset/mcp-atlassian/pull/1448","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0","tags":["Release Notes"]},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6vmq-24h2-pj7j","tags":["Exploit","Vendor Advisory"]},{"url":"https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6vmq-24h2-pj7j","tags":["Exploit","Vendor Advisory"]}],"hasPoc":true,"ai":{"summary":"The flaw allows attackers to write files within the working directory, potentially leading to code execution by importing the modified module.","exploitability":"Exploitation is relatively easy as it requires an attacker to manipulate file writes within the working directory. Precondition is access to the Confluence attachment call sites.","blast_radius":"If exploited, the impact could be severe, allowing for code execution within the application, potentially leading to full system compromise.","remediation":"Upgrade to version 0.22.0 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","code-execution","file-write","web","patch"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-29T08:56:14.392Z"}}