# CVE-2026-3693: Shy2593666979 AgentChat User Endpoint user.py update_user_info resource injection

> Attackers can manipulate user_id parameters to access or modify other users' information in AgentChat due to improper resource identifier control.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Mar 2026
- **Updated:** 11 Mar 2026
- **Also known as:** GHSA-frqp-x7gx-64vp

## What is CVE-2026-3693?

CVE-2026-3693 is a medium-severity vulnerability in Shy2593666979 AgentChat, published on 8 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw has been found in Shy2593666979 AgentChat up to 2.3.0. This issue affects the function get_user_info/update_user_info of the file /src/backend/agentchat/api/v1/user.py of the component User Endpoint. This manipulation of the argument user_id causes improper control of resource identifiers. It is possible to initiate the attack remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-99 (Improper Control of Resource Identifiers)

## Which versions are affected by CVE-2026-3693?


## How do I fix CVE-2026-3693?

No fix has been published for CVE-2026-3693 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3693 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3693 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3693 and fix it if it is affected.

What it is: CVE-2026-3693 is a medium-severity vulnerability in Shy2593666979 AgentChat, published on 8 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3693 exists.

Affected product: Shy2593666979 AgentChat. 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-2026-3693/ (Markdown: https://insights.sbomify.com/CVE-2026-3693/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3693
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3693
- OSV: https://osv.dev/vulnerability/CVE-2026-3693

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3693/
Summaries are generated and may contain mistakes; the official description above is the record.