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Description

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 Reserved 2026-04-13 | Published 2026-04-17 | Updated 2026-04-21 | Assigner VulnCheck




CRITICAL: 9.1CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CRITICAL: 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem types

CWE-636 Not Failing Securely ('Fail Open')

Product status

Default status
unaffected

Any version before 0.3.9
affected

c7bb1676f4d037609f041bf39e4e2bd52e8f9820 (git)
unaffected

Credits

Chia Min Jun Lennon finder

References

github.com/volcengine/OpenViking/releases/tag/v0.3.9 release-notes

github.com/volcengine/OpenViking/pull/1447 issue-tracking

github.com/...ommit/c7bb1676f4d037609f041bf39e4e2bd52e8f9820 patch

www.vulncheck.com/...entication-bypass-via-vikingbot-openapi third-party-advisory

cve.org (CVE-2026-40525)

nvd.nist.gov (CVE-2026-40525)

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