{"data":{"id":"8c090e4b-fe1d-4280-b87b-4e81df892192","title":"GHSA-93xw-j965-9mx3: MCP Atlassian: Arbitrary file read/exfiltration via upload_attachment missing validate_safe_path()","summary":"The `upload_attachment` method in MCP Atlassian (a tool that connects AI agents to Atlassian software) reads and uploads any file from the server without checking if the file path is safe, while the download methods correctly use a safety check called `validate_safe_path()`. This means an AI agent or attacker could read sensitive files like SSH keys, passwords, or credentials and steal them by uploading them to Confluence.","solution":"Add `validate_safe_path(file_path)` before the `os.path.exists()` check in the `upload_attachment` method in `src/mcp_atlassian/confluence/attachments.py` (lines 35-79), matching the existing pattern already used in the download methods. The function is already imported at line 9 of the same file.","labels":["security"],"sourceUrl":"https://github.com/advisories/GHSA-93xw-j965-9mx3","publishedAt":"2026-09-22T20:36:37.000Z","cveId":"CVE-2026-77258","cweIds":null,"cvssScore":null,"cvssSeverity":"high","severity":"high","attackType":["data_extraction"],"issueType":"vulnerability","affectedPackages":["mcp-atlassian@< 0.22.0 (fixed: 0.22.0)"],"affectedVendors":["LangChain"],"affectedVendorsRaw":["mcp-atlassian","Atlassian","Confluence"],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":"unknown","epssScore":0,"patchAvailable":true,"disclosureDate":"2026-09-22T20:36:37.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"trivial","impactType":["confidentiality","integrity"],"aiComponentTargeted":"agent","llmSpecific":false,"classifierConfidence":0.92,"researchCategory":null,"atlasIds":null}}