Summary
CVE-2025-30208 is a Vite development server flaw that lets attackers bypass file access restrictions. By using specially crafted URLs, files outside the allowed list can be accessed due to improper handling of trailing query characters. It affects versions before 6.2.3, 6.1.2, 6.0.12, 5.4.15, and 4.5.10, and only impacts servers exposed to the network.
Urgent Actions Required
- Upgrade Vite to a fixed release: 6.2.3, 6.1.2, 6.0.12, 5.4.15, or 4.5.10 to eliminate the file access bypass.
- Avoid exposing the Vite development server to external networks; do not use the --host flag or server.host configuration unless necessary.
- Run the dev server on localhost only when using affected versions, as publicly reachable setups are the ones impacted.
Which Systems Are Vulnerable to CVE‑2025‑30208?
Technical Overview
- Vulnerability Type: Arbitrary File Read via File Access Restriction Bypass in Vite Dev Server
- Affected Software/Versions:
Vite versions prior to:- 6.2.3
- 6.1.2
- 6.0.12
- 5.4.15
- 4.5.10
- Attack Vector: Network access to an exposed Vite development server
- CVSS Score: 5.3
- CVSS Vector: v3.1
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: None
- User Interaction: Required
- Scope: Unchanged
- Confidentiality Impact: High
- Integrity Impact: None
- Availability Impact: None
- Patch Availability: Yes, available
Vite bypasses server.fs.deny when using ?raw?? · CVE-2025-30208 · GitHub Advisory Database · GitHub
How Does the CVE‑2025‑30208 Exploit Work?
The attack typically follows these steps:
What Causes CVE‑2025‑30208?
Vulnerability Root Cause:
The issue originates from inconsistent handling of URL query strings during request processing in the Vite development server. Trailing query separators, such as extra question marks, are removed in multiple processing steps but are not properly considered in the regular expressions used to enforce file access restrictions. This mismatch allows specially crafted requests to bypass the @fs allowlist checks, resulting in unintended file exposure.
How Can You Mitigate CVE‑2025‑30208?
If immediate patching is delayed or not possible:
- Do not expose the Vite development server to external networks; avoid using –host or setting server.host to a publicly reachable address.
- Run the dev server on localhost only to prevent external access.
- Use firewalls or internal proxies to block untrusted access to the Vite dev server.
- Try accessing sensitive files (e.g., @fs/…) to ensure unauthorized access is blocked.
Which Assets and Systems Are at Risk?
Asset Types Affected:
- Frontend development environments using Vite dev server
- Web applications built with vulnerable Vite versions
- Development systems where the Vite dev server is enabled with network access
Business-Critical Systems at Risk:
- Development or staging environments exposing sensitive files through the Vite dev server
- Systems storing configuration files, environment files, or other readable local files accessible via the dev server
Exposure Level:
- Externally reachable Vite dev servers started with --host or server.host enabled
- Networkaccessible development setups where file system access is not properly restricted
Will Patching CVE‑2025‑30208 Cause Downtime?
Patch application impact: Update Vite to 6.2.3, 6.1.2, 6.0.12, 5.4.15, or 4.5.10 to fix the issue; downtime is minimal.
How Can You Detect CVE‑2025‑30208 Exploitation?
Exploitation Signatures:
Look for HTTP requests targeting the Vite dev server that access the @fs path with abnormal query strings, specifically requests appending ?raw?? or ?import&raw??. These patterns indicate attempts to bypass Vite’s file access restrictions.
Indicators of Compromise (IOCs/IOAs):
- Requests to paths beginning with /@fs/ that include trailing or repeated question marks
- Successful responses returning file contents for paths outside the configured allow list
- Access to system or configuration files when the dev server is exposed using --host or server.host
Behavioral Indicators:
- File contents are served despite @fs restrictions being enabled
- Requests succeed only when crafted query parameters are present
- Arbitrary file reads occur exclusively on networkexposed dev servers
Alerting Strategy:
- Priority: High
- Trigger alerts for:
- Any request to @fs containing ?raw?? or ?import&raw??
- File read responses originating from Vite dev servers bound to external interfaces
Compliance & Governance Notes
Audit Trail Requirement:
- Track and document Vite versions in use across environments to ensure no affected version is running in production or externally accessible.
Policy Alignment:
- Enforce policies to limit network exposure of Vite development servers, ensuring they are run on localhost unless absolutely required.
- Mandate timely upgrades to patched Vite versions whenever vulnerabilities like CVE-2025-30208 are disclosed.
Where Can I Find More Information on CVE‑2025‑30208?
CVSS Breakdown Table
| Metric | Value | Description |
|---|---|---|
| Base Score | 5.3 | Medium severity vulnerability indicating moderate impact and exploitability |
| Attack Vector | Network | Exploitable remotely over HTTP/HTTPS if the Vite dev server is exposed |
| Attack Complexity | High | Exploitation requires specific crafted URL/query parameters |
| Privileges Required | None | No authentication or elevated privileges are needed |
| User Interaction | Required | The attacker must craft and send a specific request to exploit |
| Scope | Unchanged | Only the affected Vite dev server is impacted; other systems remain unaffected |
| Confidentiality Impact | High | Arbitrary files can be read from the server if accessible |
| Integrity Impact | None | No unauthorized modification of data or code occurs |
| Availability Impact | None | Exploitation does not affect service availability |
