CVE-2026-77248: MCP Atlassian Unauthenticated Arbitrary Local File Read Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-cc5h-2pwp-pvcc",
  "modified" : "2026-09-22T20:34:43Z",
  "published" : "2026-09-22T20:34:43Z",
  "aliases" : [ "CVE-2026-77248" ],
  "summary" : "MCP Atlassian: Unauthenticated arbitrary local file read via upload_attachment file_path, chained with missing auth on streamable-http transport",
  "details" : "### Summary\nIn the documented multi-user HTTP deployment (`--transport streamable-http` with global operator Atlassian credentials), sooperset/mcp-atlassian exposes all tools to **unauthenticated network clients**, and the `upload_attachment` tool reads an attacker-supplied `file_path` with **no path validation**. Chained, an unauthenticated network attacker reads arbitrary files on the MCP server host (e.g. `/proc/self/environ` → the operator's Atlassian API token + `.env` secrets, `~/.ssh/id_rsa`, `/etc/passwd`) by uploading them to an attacker-chosen page/issue and reading them back.\n\n### Details\n**Missing authentication (transport):**\n- streamable-http binds `0.0.0.0` by default (`src/mcp_atlassian/__init__.py:151`).\n- The OAuth-proxy auth provider is opt-in (`ATLASSIAN_OAUTH_PROXY_ENABLE`, default false), so `main_mcp` is built with `auth=None` (`src/mcp_atlassian/servers/main.py:724-731, 813-817`).\n- `UserTokenMiddleware._parse_auth_header` sets `auth_validation_error` only for a *malformed* Authorization header; a request with **no** Authorization header passes through (`main.py:416-446, 582-595`).\n- `_get_fetcher` then falls through to the global credential fallback using the operator's `.env` Atlassian token (`src/mcp_atlassian/servers/dependencies.py:644-676`). `check_write_access` gates only on read-only mode, not auth → read **and** write tools reachable.\n\n**Arbitrary file read (sink):**\n- `upload_attachment`'s `file_path` flows unsanitized into `open(file_path, 'rb')` — Confluence `src/mcp_atlassian/confluence/attachments.py:477` (from `servers/confluence.py:1294-1369`); Jira `src/mcp_atlassian/jira/attachments.py:386` (from `servers/jira.py:1609-1673`). No `validate_safe_path` / allowlist (contrast the download flow, hardened after CVE-2026-27825).\n\n### Proof of Concept\n```\n# unauthenticated (no Authorization header) against a default streamable-http deployment:\ntools/call upload_attachment { \"file_path\": \"/proc/self/environ\", \"page_id\": \"<attacker-chosen>\" }\n# then read it back:\ntools/call download_attachment { ... }   # returns the bytes (base64) -> operator's ATLASSIAN token + .env secrets\n```\n\n### Impact\nUnauthenticated arbitrary local file read on the MCP server host — including the operator's Atlassian API token and `.env` secrets — a boundary the Atlassian-scoped tool must not cross, plus unauthenticated use of every read/write Atlassian tool as the operator's (often admin) principal.  Distinct from GHSA-xjgw-4wvw-rgm4 (file *write* via download_path) and GHSA-7r34-79r5-rcc9 (URL-header SSRF). \n\n### Suggested fix\nRequire authentication on the streamable-http transport by default (do not fall back to operator global credentials for unauthenticated requests); apply `validate_safe_path`/allowlist to `file_path` in `upload_attachment` as the download flow already does.\n\n### Affected\n`mcp-atlassian` <= 0.21.1.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "mcp-atlassian"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.22.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-cc5h-2pwp-pvcc"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sooperset/mcp-atlassian/pull/1448"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sooperset/mcp-atlassian"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-22T20:34:43Z",
    "nvd_published_at" : null
  }
}