Vulnerability in Volcengine Openviking
CVE-2026-40525
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.008 (54.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.002
Affected products
- Volcengine Openviking — versions 0, c7bb1676f4d037609f041bf39e4e2bd52e8f9820
Weakness classification (CWE)
References
- github.com/volcengine/OpenViking/releases/tag/v0.3.9 (release-notes, Release Notes)
- github.com/volcengine/OpenViking/pull/1447 (issue-tracking, Exploit, Patch, Vendor Advisory)
- github.com/volcengine/OpenViking/commit/c7bb1676f4d037609f041bf39e4e2bd52e8f9820 (Patch, patch)
- www.vulncheck.com/advisories/openviking-authentication-bypass-via-vikingbot-ope… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-40525?
- CVE-2026-40525 is a critical-severity vulnerability in Volcengine Openviking, classified under CWE-636. CVSS score: 9.1/10. Published 2026-04-17.
- How severe is CVE-2026-40525?
- Critical severity. CVSS v3 base score is 9.1 out of 10.