grpc-ecosystem grpc-gateway 2.28.0 Method Override ServeMux.ServeHTTP X-HTTP-Method-Override access control

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k1.17

Summaryinfo

A vulnerability was found in grpc-ecosystem grpc-gateway 2.28.0 and classified as critical. Affected is the function ServeMux.ServeHTTP of the component Method Override Handler. Executing a manipulation of the argument X-HTTP-Method-Override can lead to access control. This vulnerability is handled as CVE-2026-37236. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in grpc-ecosystem grpc-gateway 2.28.0. It has been declared as critical. This vulnerability affects the function ServeMux.ServeHTTP of the component Method Override Handler. The manipulation of the argument X-HTTP-Method-Override with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-37236 since 04/06/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

Applying the patch 72123cd4f32545f6e1376873f412dcdcbcf29acc is able to eliminate this problem.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 72123cd4f32545f6e1376873f412dcdcbcf29acc

Timelineinfo

04/06/2026 CVE reserved
08/28/2026 +144 days Advisory disclosed
08/28/2026 +0 days VulDB entry created
08/28/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-37236 (🔒)
GCVE (CVE): GCVE-0-2026-37236
GCVE (VulDB): GCVE-100-396736

Entryinfo

Created: 08/28/2026 17:47
Changes: 08/28/2026 17:47 (57)
Complete: 🔍
Cache ID: 216::103

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