CVE-2026-37236: 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.
Overview
- Severity
- Medium (CVSS 5.3)
- CVSS Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2026-Aug
- Released
- 2026-09-02
- Last Updated
- 2026-10-10
- EPSS Score
- 0.43% (percentile: 36.2%)
Affected Products (36)
Other
- 21688-17084
- 21768-17084
- 21744-17084
- 21743-17084
- 21682-17084
- 21771-17084
- 21745-17084
- 21741-17084
- 21746-17084
- 21705-17084
- 21693-17084
- 21828-17084
- 21831-17084
- 21833-17084
- 21807-17084
- 21834-17084
- 21907-17084
- 21912-17084
- 21913-17084
- 21769-17084
- 21770-17084
- 21652-17084
- 21691-17084
- 21747-17084
- 21826-17084
- 21827-17084
- 21830-17084
- 21832-17084
- 21836-17084
- 21908-17084
- 21909-17084
- 21910-17084
- 21911-17084
- 21904-17084
- 21893-17084
- 21914-17084
Security Updates (1)
Revision History
- 2026-09-02: Information published.
- 2026-09-07: Information published.
- 2026-09-08: Information published.
- 2026-09-09: Information published.
- 2026-09-09: Information published.
- 2026-09-11: Information published.
- 2026-09-13: Information published.
- 2026-09-15: Information published.
- 2026-09-17: Information published.
- 2026-09-18: Information published.
- 2026-09-19: Information published.
- 2026-09-23: Information published.
- 2026-09-24: Information published.
- 2026-09-25: Information published.
- 2026-10-02: Information published.
- 2026-10-07: Information published.
- 2026-10-10: Information published.