GHSA-hm3f-q6rw-m6wh Parse Server: `PagesRouter` path traversal allows reading files outside configured pages directory

• npm parse-server: < 8.6.8 → fixed in 8.6.8 • npm parse-server: >= 9.0.0-alpha.1, < 9.5.0-alpha.8 → fixed in 9.5.0-alpha.8

Impact The `PagesRouter` static file serving route is vulnerable to a path traversal attack that allows unauthenticated reading of files outside the configured `pagesPath` directory. The boundary check uses a string prefix comparison without enforcing a directory separator boundary. An attacker can use path traversal sequences to access files in sibling directories whose names share the same prefix as the pages directory (e.g. `pages-secret` starts with `pages`). This affects any Parse Server deployment with the `pages` feature enabled (`pages.enableRouter: true`). Exploitation requires a sibling directory of `pagesPath` whose name begins with the same string as the pages directory name. Patches The fix enforces a path separator boundary in the check, ensuring resolved paths must be strictly inside the `pagesPath` directory. Workarounds Ensure the `pagesPath` directory has no sibling directories whose names begin with the same prefix. For example, if `pagesPath` is `/srv/pages`, ensure no directory like `/srv/pages-backup` or `/srv/pages_old` exists alongside it. References • GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-hm3f-q6rw-m6wh • Fix for Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.8 • Fix for Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.8