---
title: "CVE-2026-103270: LightLLM - Broken Access Control"
description: "LightLLM through 1.2.0 contains a broken access control vulnerability caused by reinforcement learning control routes on the public HTTP API lacking authentication checks, letting unauthenticated attackers disrupt inference operations, exploit requires deployments started with --enable_rl."
url: https://panop.io/threat-heartbeat/CVE-2026-103270/
---

# CVE-2026-103270 LightLLM - Broken Access Control

LightLLM through 1.2.0 contains a broken access control vulnerability caused by reinforcement learning control routes on the public HTTP API lacking authentication checks, letting unauthenticated attackers disrupt inference operations, exploit requires deployments started with --enable\_rl.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.51% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-103270)

## Details

Type

Broken Access Control

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

30 September 2026

Updated

15 October 2026

Weakness

[CWE-306](https://cwe.mitre.org/data/definitions/306.html)

## Vendor fix

Update to the latest version with authentication checks on reinforcement learning control routes.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-103270](https://nvd.nist.gov/vuln/detail/CVE-2026-103270)
- [https://www.vulncheck.com/advisories/lightllm-through-1.2.0-missing-authentication-on-rl-control-routes](https://www.vulncheck.com/advisories/lightllm-through-1.2.0-missing-authentication-on-rl-control-routes)
- [https://github.com/ModelTC/LightLLM](https://github.com/ModelTC/LightLLM)
- [https://github.com/ModelTC/LightLLM/issues/1609](https://github.com/ModelTC/LightLLM/issues/1609)
- [https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api\_http.py#L505-L507](https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http.py#L505-L507)
- [https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api\_http\_rl.py#L51-L139](https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http_rl.py#L51-L139)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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