CVE-2026-40525 CRITICAL

CVE-2026-40525: OpenViking < 0.3.9 Authentication Bypass via VikingBot OpenAPI

Vendor Volcengine
Product OpenViking
Weakness CWE-636
Published April 17, 2026
Last update April 21, 2026

CVSS base score

9.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

OpenViking prior to version 0.3.9 contains an authentication bypass vulnerability in the VikingBot OpenAPI HTTP route surface where the authentication check fails open when the api_key configuration value is unset or empty. Remote attackers with network access to the exposed service can invoke privileged bot-control functionality without providing a valid X-API-Key header, including submitting attacker-controlled prompts, creating or using bot sessions, and accessing downstream tools, integrations, secrets, or data accessible to the bot.

Key dates

02Disclosure timeline

April 17, 2026 CVE published
April 21, 2026 Record updated