Missing Authorization in Apache bRPC - CVE-2026-84748
Published: October 23, 2026
Vulnerability identifier: #VU157365
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-84748
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to access internal-only builtin services and disclose sensitive runtime information through the public port.
The vulnerability exists due to missing authorization in Apache bRPC's protobuf-based protocol dispatch paths when the security_mode restriction associated with ServerOptions.internal_port is computed but not enforced before method invocation. A remote attacker can invoke builtin services by name over an enabled protobuf-based protocol on the public port to obtain metrics, flags, or profiler data intended for internal access only.
Affected software
Apache bRPC
How to mitigate CVE-2026-84748
Install security update from vendor's website.
Apache bRPC - update to 1.18.0