# CVE-2026-31942: LibreChat has IDOR in API Keys Management that allows any authenticated user to overwrite other users' API keys

> Authenticated users can overwrite other users' API keys via IDOR, enabling service disruption or traffic redirection.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L`)
- **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:** 2 Jun 2026
- **Updated:** 3 Jun 2026
- **Also known as:** GHSA-5jcj-rh68-cgj7

## What is CVE-2026-31942?

CVE-2026-31942 is a high-severity missing authorization vulnerability in Librechat Librechat, published on 2 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. In versions up to and including 0.7.6, an Insecure Direct Object Reference (IDOR) vulnerability exists in the API keys management endpoint (PUT /api/keys). Due to the use of the JavaScript object spread operator after setting the authenticated user's ID, any authenticated user can inject a userId parameter in the request body to overwrite any other user's API keys (e.g., OpenAI, Anthropic, Azure). This allows an attacker to replace a victim's API key configuration, potentially routing the victim's conversations through attacker-controlled keys or denying service by providing invalid keys. This is patched in version 0.8.3-rc1.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-31942?

It affects 1 product.


Products: Librechat Librechat.

## How do I fix CVE-2026-31942?

No fix has been published for CVE-2026-31942 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-31942 being exploited?

There is no known exploitation of CVE-2026-31942 in the wild and no public exploit code.

## Other vulnerabilities in Librechat Librechat

- [CVE-2026-32625](https://insights.sbomify.com/CVE-2026-32625/): LibreChat Exfiltrates Server Secrets via MCP Server URL Injection (critical 9.6)
- [CVE-2024-11167](https://insights.sbomify.com/CVE-2024-11167/): Improper Access Control in danny-avila/librechat (critical 9.4)
- [CVE-2026-22252](https://insights.sbomify.com/CVE-2026-22252/): LibreChat MCP Stdio Remote Command Execution (critical 9.1)
- [CVE-2025-69222](https://insights.sbomify.com/CVE-2025-69222/): LibreChat is vulnerable to Server-Side Request Forgery due to missing restrictions (critical 9.1)
- [CVE-2024-41704](https://insights.sbomify.com/CVE-2024-41704/): Path traversal in n/a (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-31942 and fix it if it is affected.

What it is: CVE-2026-31942 is a high-severity missing authorization vulnerability in Librechat Librechat, published on 2 Jun 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-2026-31942 in the wild and no public exploit code.

Affected product: Librechat Librechat. 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-2026-31942/ (Markdown: https://insights.sbomify.com/CVE-2026-31942/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-31942
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31942
- OSV: https://osv.dev/vulnerability/CVE-2026-31942

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-31942/
Summaries are generated and may contain mistakes; the official description above is the record.