CVE-2025-64166
MEDIUM EPSS 5.5%
Published Mar 5, 20263mo ago · Modified Mar 13, 20263mo ago
5.4 CVSS 3.1
Published Mar 5, 2026 3mo ago
Last Modified Mar 13, 2026 3mo ago
Description
Mercurius is a GraphQL adapter for Fastify. Prior to version 16.4.0, a cross-site request forgery (CSRF) vulnerability was identified. The issue arises from incorrect parsing of the Content-Type header in requests. Specifically, requests with Content-Type values such as application/x-www-form-urlencoded, multipart/form-data, or text/plain could be misinterpreted as application/json. This misinterpretation bypasses the preflight checks performed by the fetch() API, potentially allowing unauthorized actions to be performed on behalf of an authenticated user. This issue has been patched in version 16.4.0.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Low
Integrity Low
Availability None
Threat Intelligence
EPSS Exploit Probability
5.5% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available
Weaknesses 1
CWE-352 Cross-Site Request Forgery (CSRF) Authentication
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| mercurius_project | mercurius | * | <16.4.0 |
References 3
- github.com https://github.com/mercurius-js/mercurius/commit/962d402ec7a92342f4a1b7f5f04af01776838c3c
- github.com https://github.com/mercurius-js/mercurius/pull/1187
- github.com https://github.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57
Remediation
- github.com https://github.com/mercurius-js/mercurius/commit/962d402ec7a92342f4a1b7f5f04af01776838c3c
- github.com https://github.com/mercurius-js/mercurius/pull/1187
- github.com https://github.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57