djust provides Phoenix LiveView-style reactive server-side rendering for Django with Rust-powered performance. From 0.9.0 until 1.0.10, 1.1.7, 1.2.4, and 1.3.0rc8, the find_handlers_for_template MCP tool in python/djust/mcp/server.py accepts an existing absolute template_path and reads it without restricting the resolved path to the project or configured template directories. A local MCP client can use the tool as a file existence and readability oracle and can obtain substrings that match the tool's dj-click, dj-submit, dj-change, dj-input, dj-keydown, or dj-keyup attribute pattern from files readable by the djust process. The maintainer assessment states that the MCP server communicates over local stdio as the same operating-system user and has no network listener, and the tool does not return arbitrary raw file contents. This issue is fixed in versions 1.0.10, 1.1.7, 1.2.4, and 1.3.0rc8.

Affected: PyPI: djust

### Affected version / file / line Version: djust v1.1.4 (latest release, published 2026-09-23). File: python/djust/mcp/server.py:354-433 (MCP tool find_handlers_for_template). Confirmed identical on the commit used for triage, a7e4fafd1667b4db0b1465652d4a63cb17117a07.

### Description ``` @mcp.tool() def find_handlers_for_template(template_path: str) -> str: """ Args: template_path: Either a logical template name (e.g. 'demos/counter.html' — what you'd pass to `render`) OR an absolute filesystem path. Both are searched. """ ... resolved_path: str | None = None if os.path.isabs(template_path) and os.path.isfile(template_path): resolved_path = template_path else: ... # logical-name resolution via Django's template loader ... with open(resolved_path, "r", encoding="utf-8", errors="replace") as f: source = f.read() handler_names_in_template = sorted({m.group(2) for m in dj_event_attr_re.finditer(source)}) ``` When template_path is an absolute path to an existing file, it is used directly, with no confinement to the project/template directories — no realpath() + prefix check, no allowlist. open(resolved_path, ...) then reads the file.

This is inconsistent with the sibling tool in the same file (loaddata, ~line 290-303), which explicitly rejects paths outside the project directory for its own path-like parameter: ``` candidate = os.path.realpath(...) if base_dir and not candidate.sta…