CVE-2025-31125 is an improper access control vulnerability in Vite Vitejs. CISA added it to the Known Exploited Vulnerabilities catalogue on 22 January 2026, which means attackers have used it in real attacks. Vite Vitejs contains an improper access control vulnerability that exposes content of non-allowed files using ?inline&import or ?raw?import.
Why this Vite vulnerability matters
CVE-2025-31125 is an improper access control issue in Vite Vitejs, and the security significance is straightforward: a build or development-time file access flaw can expose content that should remain outside the requester's view. In practice, that kind of weakness can turn a convenience feature into an unintended file disclosure path.
Because the affected surface is an application framework rather than a single app, the risk is often inherited by many projects at once. Treat this as a reminder to track framework advisories closely, verify exposure in each deployed environment, and use the vendor's guidance and the CVE Program and NIST National Vulnerability Database for authoritative record details.
How improper access control appears in framework tooling
Improper access control means the software fails to enforce the boundary between allowed and disallowed data. In a framework context, that can happen when request parameters, import helpers, or asset-resolution logic are accepted too broadly and the code returns file content that should have been blocked.
The danger is not limited to source code files. Build artifacts, environment files, configuration material, and other sensitive repository content may also be exposed if the access check is misplaced or bypassed. That makes the issue especially relevant in development servers, preview systems, and any workflow where a framework reads from the local filesystem on behalf of a request.
Exposure and remediation priorities
Organisations should first determine whether any instance of Vite is present in internet-reachable tooling, developer portals, CI preview environments, or exposed internal services. Asset inventory matters here because a vulnerability like this can sit in a dependency that is not immediately obvious from the externally visible application stack.
Where patching is delayed, reduce exposure by restricting who can reach the affected service, limiting filesystem access to the minimum necessary, and removing sensitive files from locations the framework can read if that is operationally safe. If there is any indication the issue was reachable before remediation, review whether secrets, tokens, or configuration values may have been exposed and rotate anything that could now be in attacker hands.
Detection and post-patch review
For this kind of flaw, detection is partly about access patterns and partly about evidence review. Look for requests using the affected import or raw-content style parameters, unusual file reads in logs, and any downstream signs that hidden content was retrieved or cached unexpectedly. If the service is instrumented, correlate those requests with file-system access and response anomalies.
After patching, do not assume the problem is closed just because the code has been updated. Re-check logs, caches, source maps, temporary files, and any places where retrieved content might have been stored or forwarded. If the application handled credentials, private configuration, or deployment material, review whether those values should be replaced even if you have not confirmed direct abuse.
Risk and Threat Considerations
This vulnerability matters because file-disclosure bugs in widely used tooling can expose secrets, internal source material, and deployment details long before defenders notice. Attackers often target these issues to harvest information that helps them move deeper into a development or production environment.
Failure mechanism: The framework accepts a request path or import hint that should have been blocked, then returns content from a non-allowed file instead of enforcing the intended access boundary.
Impact: Exposed files can reveal secrets, environment settings, internal code, or other material that enables follow-on compromise, including credential theft, lateral movement, or more targeted exploitation.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8, NIST SP 800-53 Rev 5 and OWASP ASVS set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-2 — Software Inventory | Vite exposure depends on knowing where the framework is deployed. |
| CIS-4 — Secure Configuration of Enterprise Assets and Software | Improper access control in framework tooling is addressed through secure configuration. | |
| Recommendation — Inventory all Vite instances and prioritize exposed deployments for remediation. Harden framework file-access settings and restrict reachable preview surfaces. | ||
| NIST SP 800-53 Rev 5 | AC-3 — Access Enforcement | This CVE is an access-control failure that should have been blocked by enforcement logic. |
| SI-2 — Flaw Remediation | A known exploited vulnerability requires tracked remediation and verification. | |
| Recommendation — Enforce request and file-access boundaries so non-allowed content cannot be returned. Apply the vendor fix promptly and verify vulnerable instances are removed from service. | ||
| OWASP ASVS | V8 — Authorization | The issue is a broken authorization boundary over file access in framework behavior. |
| Recommendation — Verify that file and resource access checks reject any non-authorised path or import. | ||
Practitioner Guidance
What to watch for: Treat this as a framework-level access control problem, not just a single CVE entry. The practical question is whether your deployments depend on file-serving or import behavior that can be reached from untrusted requests.
Governance implication: Keep framework dependencies in your vulnerability process, not just application code. When a framework flaw can expose local files, ownership should include application security, platform engineering, and the teams responsible for secret rotation and exposure review.
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Reviewed and updated by the NHIMG editorial team on October 17, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org