Unauthenticated Event Publishing in Vanus EventBus Gateway

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.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

Vanus versions 0.8.0 through 0.9.0 suffer from a critical missing authentication vulnerability in their CloudEvents HTTP receiver. Attackers can bypass token authentication and authPublish checks by sending forged CloudEvents directly to the /namespaces/{ns}/eventbus/{name}/events and /gateway/{name} endpoints, allowing unauthorized event injection into any eventbus. This vulnerability affects any organization deploying Vanus as an event streaming platform, particularly those exposing the gateway to untrusted networks. The ability to publish arbitrary events enables attackers to poison event streams, trigger downstream system actions, inject malicious payloads into subscription sinks, or disrupt critical event-driven workflows without any credentials.

Casky's 283 mapped skills—leveraging Claude AI's extended reasoning capabilities—detect this attack pattern through coverage of MITRE ATT&CK's TA0004 (Privilege Escalation) and TA0006 (Credential Access) techniques. Practitioners using Casky would identify suspicious patterns including: unauthenticated HTTP POST requests to eventbus endpoints lacking valid bearer tokens, forged CloudEvents with unexpected namespaces or event types reaching protected event buses, successful event delivery without corresponding authentication logs, and lateral movement attempts where injected events trigger actions in downstream systems. The platform's skill mapping helps security teams correlate authentication bypass attempts (CWE-306) with event injection patterns, enabling detection of both the initial gateway exploitation and downstream impact from malicious event propagation across subscription sinks.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-111999.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-111999

Casky has 283 skills that investigate the attack patterns behind CVE-2026-111999. Run one and get CVSS-scored findings in 3 minutes.

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