Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-40525

CVE-2026-40525CRITICAL

volcengine OpenViking — OpenViking < 0.3.9 Authentication Bypass via VikingBot OpenAPI

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   N   H   H   N    9.1   .0076   54.5     —

AFFECTED
  Product     Versions     Fixed
  OpenViking  unspecified  c7bb1676f4d037609f041bf39e4e2bd52e8f9820

TIMELINE
  Apr 13  Reserved by VulnCheck
  Apr 17  Published (CNA: VulnCheck)
  Oct 8   EXPLOIT PUBLISHED — CVE-2026-40525 (volcengine OpenViking). Public exploit reference added.

CWE-636 · CNA: VulnCheck · CVSS v4.0 · 4 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 13, 2026	Reserved	Reserved by VulnCheck
April 17, 2026	Published	Published (CNA: VulnCheck)
October 8, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-40525 (volcengine OpenViking). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
volcengine	OpenViking	—	—	c7bb1676f4d037609f041bf39e4e2bd52e8f9820

Weaknesses

CWE-636

References (4)

https://github.com/volcengine/OpenViking/commit/c7bb1676f4d037609f041bf39e4e2bd52e8f9820 [Patch]
https://github.com/volcengine/OpenViking/pull/1447 [Exploit, Patch, Vendor Advisory]
https://github.com/volcengine/OpenViking/releases/tag/v0.3.9 [Release Notes]
https://www.vulncheck.com/advisories/openviking-authentication-bypass-via-vikingbot-openapi [Third Party Advisory]

Authoritative record: CVE-2026-40525 at cve.org

Vendors: volcengine

Weaknesses: CWE-636

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-40525 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.