SB20261110292 - Incorrect authorization in grpc

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Main Vulnerability Database SB20261110292

SB20261110292 - Incorrect authorization in grpc

Published: November 10, 2026

Security Bulletin ID SB20261110292
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Incorrect authorization (CVE-ID: N/A)

CWE-ID: CWE-863 - Incorrect Authorization

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to bypass host-based authorization and invoke restricted RPCs, potentially disclosing or modifying data.

The vulnerability exists due to inconsistent host interpretation in gRPC C-core xDS routing and RBAC when processing HTTP/2 requests containing mismatched host and :authority headers. A remote attacker can send :authority: foo and host: bar to select a route as bar while being authorized as foo, bypassing an RBAC rule denying bar.


Remediation

Install update from vendor's website.

References