Vulnerability · Published Sep 16, 2026 · Assigned by VulDB

CVE-2026-92360ag-ui-protocol ag-ui Event Application Layer agent.ts prepareRunAgentInput origin validation

Medium 6.3

In plain English

A medium-severity insufficient verification of data authenticity in ag-ui from ag-ui-protocol. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.2%top 89.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A weakness has been identified in ag-ui-protocol ag-ui 1.0. The impacted element is the function prepareRunAgentInput of the file agent/agent.ts of the component Event Application Layer. This manipulation of the argument TEXT_MESSAGE_START causes origin validation error. Remote exploitation of the attack is possible. The pull request to fix this issue awaits acceptance.

Affected products (as reported)

Vendor	Product	Versions
ag-ui-protocol	ag-ui	1.0

Weakness: CWE-346, CWE-345 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R

References

VDB-405446 | ag-ui-protocol ag-ui Event Application Layer agent.ts prepareRunAgentInput origin validation vdb-entry, technical-description
VDB-405446 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-92360 | CVE Analysis and Report third-party-advisory
Submit #934950 | ag-ui-protocol ag-ui v1.0 CWE-346 third-party-advisory
https://github.com/ag-ui-protocol/ag-ui/issues/2437 issue-tracking
https://github.com/ag-ui-protocol/ag-ui/pull/2701 issue-tracking, patch
https://github.com/ag-ui-protocol/ag-ui/ product