MEDIUM 5.3 Microsoft

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.

Microsoft Security Update 2026-Aug: 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.

Affected Products

References

Published: 2026-08-11 · Source: Microsoft · Feed updated: 2026-10-13
This medium severity vulnerability with a CVSS score of 5.3 was published on 2026-08-11 via Microsoft. Affected: azl3 cert-manager 1.12.15-11 on Azure Linux 3.0, azl3 cf-cli 8.7.11-8 on Azure Linux 3.0, azl3 cloud-provider-kubevirt 0.5.1-6 on Azure Linux 3.0 and 5 more.
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