CVE-2026-40525

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.

CVSS v3.1 Score

9.1

CRITICAL

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

EPSS — Exploit Prediction

0.0039

Probability of exploitation

0.60%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-636 CWE-636

Affected Products

Vendor	Product	Versions
volcengine	openviking	< 0.3.9

References

Advisories & Patches

https://github.com/volcengine/OpenViking/commit/c7bb1676f4d037609f041bf39e4e2bd52e8f9820 https://github.com/volcengine/OpenViking/pull/1447

Exploits

https://github.com/volcengine/OpenViking/pull/1447

Other References

https://github.com/volcengine/OpenViking/releases/tag/v0.3.9 https://www.vulncheck.com/advisories/openviking-authentication-bypass-via-vikingbot-openapi

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-40525? +

CVE-2026-40525 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0039, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-40525? +

CVE-2026-40525 affects products from volcengine, specifically: openviking. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-40525? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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