Vitejs Improper Access Control (CVE-2025-31125)

Historical catalog analysis: CISA added this entry on January 22, 2026. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2025-31125 is an improper access control vulnerability (CWE-200, CWE-284) affecting Vitejs. The flaw allows for the exposure of content from files that should not be accessible by utilizing ?inline&import or ?raw?import queries. This vulnerability was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on January 22, 2026.

Exposure and applicability

This vulnerability does not affect all Vitejs installations. It is specifically applicable to applications that have explicitly exposed the Vite development server to the network. This exposure occurs when the --host flag is used or when the server.host configuration option is enabled. Environments where the dev server remains bound to localhost are not identified as affected by this specific path.

Remediation priorities

Based on our analysis, vulnerability management teams should prioritize assets based on their network visibility and deployment environment:

1. Identify Network-Exposed Dev Servers: The primary priority is locating instances where Vitejs is running with the --host or server.host configuration in environments accessible to untrusted actors.
2. Apply Vendor Mitigations: Organizations should apply the mitigations provided by the vendor. For those utilizing cloud services, following BOD 22-01 guidance may be applicable for managing the exposure.
3. Configuration Review: If a vendor patch cannot be immediately applied, defenders should evaluate whether the dev server must remain exposed to the network or if it can be restricted to local access only.
4. Decommissioning: In cases where mitigations are unavailable and the risk of file exposure is unacceptable, discontinuing use of the affected version is recommended.

How to validate remediation

To verify that exposure has been reduced, defenders should move beyond simple version checks:

• Configuration Audit: Confirm through configuration files or process arguments that --host or server.host are either removed or restricted to authorized interfaces.
• Access Testing: In a controlled environment, attempt to access non-allowed files using the ?inline&import and ?raw?import patterns to ensure the server no longer returns the content of those files.
• Network Verification: Use network scanning tools to verify that the Vite dev server is not reachable from unauthorized network segments.

Limits and open questions

It remains unknown whether this vulnerability has been utilized in ransomware campaigns. Additionally, because Vitejs is an open-source component, it may be embedded within other third-party libraries or proprietary products; identifying all downstream instances of the vulnerable component may require a detailed Software Bill of Materials (SBOM) analysis. Residual risk persists if the dev server is required to be network-accessible for legitimate development workflows, as this maintains the primary attack vector.

Source and editorial note

CVE-2025-31125: Vite Vitejs Improper Access Control Vulnerability · Source date: January 22, 2026 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: January 25, 2026. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: September 23, 2026 at 00:19 UTC.

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