CVE-2025-64166
Mercurius: Incorrect Content-Type parsing can lead to CSRF attack
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.
INFO
Published Date :
March 5, 2026, 4:16 p.m.
Last Modified :
March 13, 2026, 6:05 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Mercurius to version 16.4.0 or later.
- Validate Content-Type header parsing.
- Implement robust CSRF protection mechanisms.
- Review and test all GraphQL endpoints.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-64166.
| URL | Resource |
|---|---|
| https://github.com/mercurius-js/mercurius/commit/962d402ec7a92342f4a1b7f5f04af01776838c3c | Patch |
| https://github.com/mercurius-js/mercurius/pull/1187 | Issue Tracking Patch |
| https://github.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57 | Exploit Patch Vendor Advisory |
| https://github.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57 | Exploit Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-64166 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-64166
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-64166 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-64166 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 13, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:mercurius_project:mercurius:*:*:*:*:*:node.js:*:* versions up to (excluding) 16.4.0 Added Reference Type GitHub, Inc.: https://github.com/mercurius-js/mercurius/commit/962d402ec7a92342f4a1b7f5f04af01776838c3c Types: Patch Added Reference Type GitHub, Inc.: https://github.com/mercurius-js/mercurius/pull/1187 Types: Issue Tracking, Patch Added Reference Type CISA-ADP: https://github.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57 Types: Exploit, Patch, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57 Types: Exploit, Patch, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 05, 2026
Action Type Old Value New Value Added Reference https://github.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57 -
New CVE Received by [email protected]
Mar. 05, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Added CWE CWE-352 Added Reference https://github.com/mercurius-js/mercurius/commit/962d402ec7a92342f4a1b7f5f04af01776838c3c Added Reference https://github.com/mercurius-js/mercurius/pull/1187 Added Reference https://github.com/mercurius-js/mercurius/security/advisories/GHSA-v66j-6wwf-jc57