by Kastro
Paper/Archive/CVE-2026-37236

CVE-2026-37236

mitre — grpc-gateway v2.28.0 is vulnerable to Incorrect Access Control.

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 37.7.377 × 207.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
n/an/a–CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgithub.com/grpc-ecosystem/grpc-gateway/commit/72123cd4f32545f6e1376873f412dcdcbcf29accrefgithub.com/grpc-ecosystem/grpc-gatewayrefs00me00ne.com/cve/cve-2026-37236