# CVE-2026-12771: BerriAI litellm M2M JWT user_api_key_auth.py improper authorization

> Remote attackers can bypass authorization checks in the LiteLLM proxy's M2M JWT handler to gain unauthorized access.

- **Severity:** Low 2.3 (`CVSS:4.0/AV:N/AC:H/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-VZ18639, GHSA-qmf3-4767-5fg3, MINI-fwqh-m27j-q8qf, MINI-gq2q-42x3-p5mw, MINI-pq2f-v295-qm52, MINI-vccg-ww56-h79g, PYSEC-2026-4075

## What is CVE-2026-12771?

CVE-2026-12771 is a low-severity missing authorization 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 vulnerability was identified in BerriAI litellm up to 1.82.2. This affects an unknown function of the file litellm/proxy/auth/user_api_key_auth.py of the component M2M JWT Handler. Such manipulation leads to improper authorization. The attack can be launched remotely. A high complexity level is associated with this attack. The exploitability is reported as difficult. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.

Weakness: CWE-285 (Improper Authorization), CWE-266 (Incorrect Privilege Assignment)

## Which versions are affected by CVE-2026-12771?

3 open source packages ship an affected version, including litellm. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `litellm` | PyPI | All versions to 1.82.2 | None |
| `litellm` | PyPI | All versions to 1.82.2 | None |
| `litellm` | PyPI | All versions to 1.82.2 | None |

Products: Litellm Litellm.

## How do I fix CVE-2026-12771?

Upgrade to a fixed version.

## Is CVE-2026-12771 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12771 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-2026-12771 and fix it if it is affected.

What it is: CVE-2026-12771 is a low-severity missing authorization 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-2026-12771 exists.

Affected packages and fixed versions:
- litellm (PyPI): affected all versions up to 1.82.2; no fix listed
- litellm (PyPI): affected all versions up to 1.82.2; no fix listed
- litellm (PyPI): affected all versions up to 1.82.2; no fix listed

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-2026-12771/ (Markdown: https://insights.sbomify.com/CVE-2026-12771/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12771
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12771
- OSV: https://osv.dev/vulnerability/CVE-2026-12771

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12771/
Summaries are generated and may contain mistakes; the official description above is the record.