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

> Attackers can bypass origin validation in the ag-ui protocol library, potentially allowing unauthorized access or interaction with the Event Application Layer.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Sep 2026
- **Updated:** 22 Sep 2026
- **Also known as:** GHSA-wvf6-r87g-jh87

## What is CVE-2026-92360?

CVE-2026-92360 is a medium-severity missing authorization vulnerability in ag-ui-protocol ag-ui, published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### 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.

Weakness: CWE-346 (Origin Validation Error), CWE-345 (Insufficient Verification of Data Authenticity)

## Which versions are affected by CVE-2026-92360?


## How do I fix CVE-2026-92360?

No fix has been published for CVE-2026-92360 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-92360 being exploited?

There is no known exploitation of CVE-2026-92360 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-92360 and fix it if it is affected.

What it is: CVE-2026-92360 is a medium-severity missing authorization vulnerability in ag-ui-protocol ag-ui, published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-92360 in the wild and no public exploit code.

Affected product: ag-ui-protocol ag-ui. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-92360/ (Markdown: https://insights.sbomify.com/CVE-2026-92360/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-92360
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-92360
- OSV: https://osv.dev/vulnerability/CVE-2026-92360

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-92360/
Summaries are generated and may contain mistakes; the official description above is the record.