VDB
CVE-2026-37236
CVE-2026-37236
PUBLISHED
CVSS 9.8 CRITICAL
Reported by mitre · Published August 28, 2026
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.
Risk Scores
CVSS 3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
| n/a | n/a | n/a, n/a |
Timeline
- Aug 28, 2026 CVE Published
- Aug 28, 2026 Coalition ESS Score
- Aug 29, 2026 EPSS Score
- Sep 2, 2026 Security Advisory
- Sep 3, 2026 EPSS Score
- Sep 6, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
- Sep 18, 2026 EPSS Score
- Sep 24, 2026 EPSS Score
- Sep 26, 2026 EPSS Score