CVE-2026-40525Public exploitNetwork attack vector

Unauthenticated bot control via fail-open API key

Published Apr 17, 2026 · Updated Apr 17, 2026

Authentication bypass in Volcengine OpenViking before 0.3.9 allows remote attackers to invoke VikingBot OpenAPI routes without a key. In verify_api_key, a falsey channel.config.api_key returned True, treating an absent configuration value as authorization rather than rejecting the request. Network access to an exposed VikingBot service is required; successful requests can control bot sessions and reach data, secrets, tools, or integrations available to the bot.

CVSS severity9.1
Critical
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Volcengine OpenViking before 0.3.9 allows remote attackers to invoke VikingBot OpenAPI routes without a key. In verify_api_key, a falsey channel.config.api_key returned True, treating an absent configuration value as authorization rather than rejecting the request. Network access to an exposed VikingBot service is required; successful requests can control bot sessions and reach data, secrets, tools, or integrations available to the bot.

The record

CVE
CVE-2026-40525
Published
Apr 17, 2026
Updated
Apr 17, 2026
Vendor
Volcengine
Product
OpenViking
Classifications
CWE-636, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Volcengine · OpenVikingversion=0 <=0.3.8

Published CVSS scores

9.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-636Not Failing Securely ('Failing Open')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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