AIKIDO-2026-343005
shiny is vulnerable to Path Traversal
69
Medium Risk
This Affects:
shinyTL;DR
Shiny for Python's bookmark restore joins a client supplied _state_id_ query parameter into the server-side bookmark directory without validating it, so a value with .. segments or an absolute path escapes the intended directory. The restore logic runs whenever a URL query string is present, even with bookmarking disabled, letting anyone probe for the existence and JSON validity of input.json and values.json at arbitrary paths, and apps combining bookmark_store="server" with ui.input_file() can have arbitrary file contents copied out through the same restore path. The fix validates _state_id_ against a [A-Za-z0-9_-]+ allowlist and only reads from disk when bookmark_store="server".
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
shiny is vulnerable to Path Traversal in versions 1.4.0 - 1.6.3.
How to fix this
Upgrade the shiny library to the patch version.
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