grpc-gateway v2.28.0 is vulnerable to Incorrect Access Control. The application processes the X-HTTP-Method-Override header in ServeMux.ServeHTTP without restricting allowed methods. When a POST request with Content-Type application/x-www-form-urlencoded includes this header, the request method is rewritten to an arbitrary attacker-supplied value before routing. This allows bypassing method-based access controls enforced by upstream proxies or WAFs.
History

Thu, 03 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Title github.com/grpc-ecosystem/grpc-gateway: grpc-gateway: Access control bypass via X-HTTP-Method-Override header
Weaknesses CWE-444
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 02 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 02 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-639
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Tue, 01 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Grpc-ecosystem
Grpc-ecosystem grpc-gateway
Vendors & Products Grpc-ecosystem
Grpc-ecosystem grpc-gateway

Fri, 28 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Description grpc-gateway v2.28.0 is vulnerable to Incorrect Access Control. The application processes the X-HTTP-Method-Override header in ServeMux.ServeHTTP without restricting allowed methods. When a POST request with Content-Type application/x-www-form-urlencoded includes this header, the request method is rewritten to an arbitrary attacker-supplied value before routing. This allows bypassing method-based access controls enforced by upstream proxies or WAFs.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-08-28T00:00:00.000Z

Updated: 2026-09-02T18:14:42.882Z

Reserved: 2026-04-06T00:00:00.000Z

Link: CVE-2026-37236

cve-icon Vulnrichment

Updated: 2026-09-02T18:14:36.814Z

cve-icon NVD

Status : Deferred

Published: 2026-08-28T16:17:46.157

Modified: 2026-09-08T19:42:20.313

Link: CVE-2026-37236

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-08-28T00:00:00Z

Links: CVE-2026-37236 - Bugzilla