Origin Validation Weakness in ag-ui Event Application Layer by ag-ui-protocol
CVE-2026-92360

5.3MEDIUM

Key Information:

Vendor

Ag-ui-protocol

Status
Ag-ui
Vendor
CVE Published:
16 September 2026

What is CVE-2026-92360?

A vulnerability has been discovered in the Event Application Layer of ag-ui 1.0, specifically within the prepareRunAgentInput function located in agent/agent.ts. This flaw arises from improper handling of the TEXT_MESSAGE_START argument, leading to a failure in validating origin requests. As a result, this weakness could potentially allow remote attackers to exploit the application. A pull request is currently pending to address this issue, highlighting the need for vigilance and prompt updates to secure systems against such vulnerabilities.

Affected Version(s)

ag-ui 1.0

References

https://vuldb.com/vuln/405446
vdb-entrytechnical-description
https://vuldb.com/vuln/405446/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-92360
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

meraklbz (VulDB User)
VulDB CNA Team
.