How severe is CVE-2026-40525?

CVE-2026-40525 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-40525 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40525?

CVE-2026-40525 affects Volcengine Openviking. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40525?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-40525 have an EU (EUVD) identifier?

Yes. CVE-2026-40525 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23464.

When was CVE-2026-40525 published?

CVE-2026-40525 was published on 2026-04-17 and last updated on 2026-06-17.

CVE-2026-40525

CVE-2026-40525 is a critical-severity vulnerability in Volcengine Openviking with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-636.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 9.1
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23464
Weakness: CWE-636
Affected product: Volcengine Openviking
Published: 2026-04-17
Last modified: 2026-06-17

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.

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.
How severe is CVE-2026-40525?: CVE-2026-40525 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-40525 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40525?: CVE-2026-40525 affects Volcengine Openviking. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40525?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-40525 have an EU (EUVD) identifier?: Yes. CVE-2026-40525 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23464.
When was CVE-2026-40525 published?: CVE-2026-40525 was published on 2026-04-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:volcengine:openviking:*:*:*:*:*:*:*:*

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