Description
Vanus 0.8.0 through 0.9.0 contains a missing authentication vulnerability that allows unauthenticated remote attackers to publish events to any eventbus through the gateway CloudEvents HTTP receiver. Attackers can send forged CloudEvents to the /namespaces/{ns}/eventbus/{name}/events or legacy /gateway/{name} paths, bypassing token authentication and authPublish checks, so they are stored and delivered to subscription sinks.
Published: 2026-10-18
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
Impact: Unauthenticated event publishing (potential data exfiltration)
Action: Patch Immediately
AI Analysis

Impact

The vulnerability allows an unauthenticated remote attacker to inject forged CloudEvents into any eventbus through the gateway HTTP receiver, bypassing token authentication and publish checks. This grants the attacker the ability to store and deliver events to subscription sinks without authorization. The impact is the unauthorized publication and potential delivery of arbitrary data to downstream users, effectively exposing data and disrupting event flows.

Affected Systems

The weakness affects versions 0.8.0 through 0.9.0 of the Vanus product from vanus-labs. All deployments using these releases are potentially exposed unless they have mitigated the gateway endpoints.

Risk and Exploitability

With a CVSS score of 8.7, the vulnerability is considered high severity. The EPSS score is currently unavailable, and the vulnerability is not listed in the CISA KEV catalog. Attackers could exploit the flaw via standard HTTP requests to the /namespaces/{ns}/eventbus/{name}/events or legacy /gateway/{name} URLs, and no special privileges are required beyond network reach.

Generated by OpenCVE AI on October 18, 2026 at 12:24 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade Vanus to the latest available version that removes the missing authentication check
  • If an upgrade is not immediately possible, restrict network access to the gateway CloudEvents HTTP receiver to trusted networks or require a valid token by implementing a reverse proxy
  • Apply firewall rules to limit inbound connections to the gateway only from known, authorized sources
  • Monitor eventbus logs for unexpected event creation patterns and disable unused legacy routes until the vulnerability is fully remediated

Generated by OpenCVE AI on October 18, 2026 at 12:24 UTC.

Tracking

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Advisories

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History

Tue, 20 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 19 Oct 2026 13:15:00 +0000

Type Values Removed Values Added
First Time appeared Vanus-labs
Vanus-labs vanus
Vendors & Products Vanus-labs
Vanus-labs vanus

Sun, 18 Oct 2026 11:45:00 +0000

Type Values Removed Values Added
Description Vanus 0.8.0 through 0.9.0 contains a missing authentication vulnerability that allows unauthenticated remote attackers to publish events to any eventbus through the gateway CloudEvents HTTP receiver. Attackers can send forged CloudEvents to the /namespaces/{ns}/eventbus/{name}/events or legacy /gateway/{name} paths, bypassing token authentication and authPublish checks, so they are stored and delivered to subscription sinks.
Title Vanus 0.8.0 through 0.9.0 Missing Authentication via Gateway CloudEvents HTTP Receiver
Weaknesses CWE-306
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

Vanus-labs Vanus
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-20T15:03:48.645Z

Reserved: 2026-10-18T01:22:31.232Z

Link: CVE-2026-111999

cve-icon Vulnrichment

Updated: 2026-10-20T15:03:42.670Z

cve-icon NVD

Status : Deferred

Published: 2026-10-18T12:17:11.870

Modified: 2026-10-20T16:17:01.100

Link: CVE-2026-111999

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-19T12:53:28Z

Weaknesses
  • CWE-306

    Missing Authentication for Critical Function