# CVE-2026-12774: BerriAI litellm MCP Server Connection Testing rest_endpoints.py _execute_with_mcp_client server-side request forgery

> Attackers can exploit a server-side request forgery vulnerability in LiteLLM's MCP server connection testing to access internal resources.

- **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:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Jun 2026
- **Updated:** 22 Jun 2026
- **Also known as:** CLEANSTART-2026-VO05387, GHSA-h9c7-cfj6-h8j6, MINI-3hwf-8c8r-694p, MINI-fw77-q95m-5f2j

## What is CVE-2026-12774?

CVE-2026-12774 is a medium-severity server-side request forgery vulnerability in BerriAI litellm, published on 21 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A security vulnerability has been detected in BerriAI litellm up to 1.82.2. Affected by this vulnerability is the function _execute_with_mcp_client of the file litellm/proxy/_experimental/mcp_server/rest_endpoints.py of the component MCP Server Connection Testing. The manipulation leads to server-side request forgery. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-12774?

It affects 1 product.


Products: Litellm Litellm.

## How do I fix CVE-2026-12774?

Upgrade to a fixed version.

## Is CVE-2026-12774 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12774 exists.

## Other vulnerabilities in BerriAI litellm

- [CVE-2026-42208](https://insights.sbomify.com/CVE-2026-42208/): BerriAI LiteLLM SQL Injection (critical 9.3, exploited in the wild)
- [CVE-2026-59822](https://insights.sbomify.com/CVE-2026-59822/): BerriAI LiteLLM Improper Authentication (high 8.8, exploited in the wild)
- [CVE-2026-42271](https://insights.sbomify.com/CVE-2026-42271/): BerriAI LiteLLM Command Injection (high 8.7, exploited in the wild)
- [CVE-2024-5751](https://insights.sbomify.com/CVE-2024-5751/): Remote Code Execution in BerriAI/litellm (critical 9.8)
- [CVE-2024-2952](https://insights.sbomify.com/CVE-2024-2952/): Server-Side Template Injection in BerriAI/litellm (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12774 and fix it if it is affected.

What it is: CVE-2026-12774 is a medium-severity server-side request forgery vulnerability in BerriAI litellm, published on 21 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12774 exists.

Affected product: BerriAI litellm. 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-2026-12774/ (Markdown: https://insights.sbomify.com/CVE-2026-12774/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12774
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12774
- OSV: https://osv.dev/vulnerability/CVE-2026-12774

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12774/
Summaries are generated and may contain mistakes; the official description above is the record.