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+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "rojo"
+date = "2026-06-02"
+url = "https://github.com/rojo-rbx/rojo/pull/1270"
+references = ["https://github.com/rojo-rbx/rojo/commit/ac6941f05483b0875fda52c7664cd42033db7fa2"]
+categories = ["code-execution", "file-disclosure"]
+keywords = ["dns-rebinding", "cross-origin", "localhost", "code-injection"]
+ 
+[versions]
+patched = [">= 7.7.0"]
+```
+ 
+# Rojo development server vulnerable to DNS rebinding, allowing unauthenticated read/write access and local program execution
+ 
+Rojo's `rojo serve` command starts an unauthenticated HTTP API on localhost
+(default port 34872) with no `Host` or `Origin` header validation. While
+direct cross-origin `fetch()` requests from a malicious website are blocked by
+the browser's default CORS policy, an attacker can use DNS rebinding to bypass
+this restriction entirely.
+ 
+The serve API is a two-way sync protocol. Once a DNS rebind is established, a
+malicious webpage visited by a developer running `rojo serve` can, without any
+further user interaction:
+ 
+- **Read the full project source:** `GET /api/rojo` returns the session ID,
+  root instance ID, and project name. `GET /api/read/{id}` enumerates the
+  complete instance tree including all script contents, exposing proprietary
+  game logic, configuration, and any secrets embedded in source files.
+- **Write to project files on disk:** `POST /api/write` pushes changes back
+  through Rojo's sync pipeline, allowing an attacker to inject arbitrary Lua
+  into the developer's project. If the developer then publishes their game,
+  the injected code executes on every player's client — a supply chain attack
+  vector.
+- **Launch local programs:** `POST /api/open/{id}` calls the OS-level
+  `opener::open()` function, which invokes the platform's default handler
+  (`open` on macOS, `xdg-open` on Linux, `start` on Windows) for the target
+  file.
+Exploitation requires only that `rojo serve` is running (the standard Roblox
+development workflow) and that the developer visits an attacker-controlled
+webpage in any browser on the same machine. The port is a fixed well-known
+default (34872), there is no authentication, and no user interaction is needed
+beyond the initial page visit.
+ 
+The flaw was corrected in [#1270](https://github.com/rojo-rbx/rojo/pull/1270),
+which adds `Host`/`Origin` header validation to reject cross-origin requests,
+gates `/api/open` to loopback clients regardless of validated origin, and emits
+a warning when the server binds to a non-loopback address.