ag-ui-protocol ag-ui 1.0 Event Application Layer agent/agent.ts prepareRunAgentInput TEXT_MESSAGE_START origin validation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.1$0-$5k1.81+

Summaryinfo

A vulnerability was found in ag-ui-protocol ag-ui 1.0. It has been declared as critical. This affects the function prepareRunAgentInput of the file agent/agent.ts of the component Event Application Layer. Such manipulation of the argument TEXT_MESSAGE_START leads to origin validation. This vulnerability is documented as CVE-2026-92360. The attack can be executed remotely. There is not any exploit available. The pull request to fix this issue awaits acceptance.

Detailsinfo

A vulnerability was found in ag-ui-protocol ag-ui 1.0 and classified as critical. Affected by this issue is the function prepareRunAgentInput of the file agent/agent.ts of the component Event Application Layer. The manipulation of the argument TEXT_MESSAGE_START with an unknown input leads to a origin validation vulnerability. Using CWE to declare the problem leads to CWE-346. The product does not properly verify that the source of data or communication is valid. Impacted is confidentiality, integrity, and availability.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-92360. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/16/2026).

The pull request to fix this issue awaits acceptance.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.1

VulDB Base Score: 6.3
VulDB Temp Score: 6.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Origin validation
CWE: CWE-346 / CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

09/16/2026 Advisory disclosed
09/16/2026 +0 days VulDB entry created
09/16/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 2437
Status: Not defined
Confirmation: 🔒

CVE: CVE-2026-92360 (🔒)
GCVE (CVE): GCVE-0-2026-92360
GCVE (VulDB): GCVE-100-405446

Entryinfo

Created: 09/16/2026 07:41
Changes: 09/16/2026 07:41 (57)
Complete: 🔍
Submitter: meraklbz
Cache ID: 216::103

Submitinfo

Accepted

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