CVE-2026-92360Network attack vector

Remote event-origin validation bypass

Published Sep 16, 2026 · Updated Sep 16, 2026

Origin validation error in AG-UI 1.0 allows remote attackers to disrupt event attribution via a crafted TEXT_MESSAGE_START argument. The public record identifies prepareRunAgentInput in agent/agent.ts but does not disclose how it mishandles the argument during origin validation. Remote reachability is reported, while authentication requirements and effects beyond incorrect event-origin handling remain undisclosed.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in AG-UI 1.0 allows remote attackers to disrupt event attribution via a crafted TEXT_MESSAGE_START argument. The public record identifies prepareRunAgentInput in agent/agent.ts but does not disclose how it mishandles the argument during origin validation. Remote reachability is reported, while authentication requirements and effects beyond incorrect event-origin handling remain undisclosed.

The record

CVE
CVE-2026-92360
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
AG-UI Protocol
Product
AG-UI
Classifications
Unavailable
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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?

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  1. Affected versionversion=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

AG-UI Protocol · AG-UIversion=1.0

Published CVSS scores

No CVSS assessment is available in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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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