Improper Authentication in Apache bRPC - CVE-2026-48830
Published: October 23, 2026
Vulnerability identifier: #VU157336
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: CVE-2026-48830
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication for protected HTTP endpoints.
The vulnerability exists due to improper authentication in Apache bRPC's HTTP connection handling when processing builtin requests on an HTTP/1.1 keep-alive connection. A remote attacker can send a builtin request as the first message on a connection, then send requests to protected non-builtin endpoints on that connection to access them without valid credentials.
Affected software
Apache bRPC
How to mitigate CVE-2026-48830
Install security update from vendor's website.
Apache bRPC - update to 1.18.0